How the three Crown Dependencies are aging — and what that means for public finances, housing, and social services. Published census data, 1951–2021, with projections to 2040.
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● IoM scenario (2026/2031/2041 only — 1996-2021 is real census data, unaffected)
HISTORICAL TREND PROJECTED FORWARD: IoM's own real cohort-transition rates, 1996-2021 average (includes both the 1990s-2000s finance-sector boom and the 2011-2016 stagnation) -- no migration adjustment on top. Population declines slightly to 80,764 by 2041.
200 years of island population. Jersey has grown fastest and furthest. Isle of Man and Guernsey both saw sharp post-war expansion then plateaued. IoM actually declined slightly 2011–2021 before recovering. Use the range selector to zoom in on any period — default is the last 50 years.
Rangeor drag to zoom
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Islands
IoM finance sector boom 1986–2006 drove steeper growth than Channel IslandsJersey grew 20% 2001–2021; IoM grew just 10%Guernsey broadly flat since 1991Use Index view to compare growth rates on a common baseline (start year = 100)
The stagnation story: All three islands are aging rapidly, but their population trajectories differ. Jersey continues modest growth. IoM and Guernsey have effectively plateaued — population in 2021 is barely above 1991 levels once you account for the composition. The implication: dependency ratio pressure cannot be relieved by population growth alone.
◆ 2026 = estimated ·
Sources: IoM Cabinet Office census Table 1 (1821–2021) · Jersey Census 1996 Table 1 (1821–2021) · Guernsey Historic Population xlsx gov.gg (1821–2021) · ONS long-run population estimates (UK)
What is a dependency ratio? It measures how many retired people exist for every 100 working-age people. A higher number means more pressure on public finances. IoM and Guernsey now exceed the UK; Jersey remains below it — but is closing the gap fast.
Isle of Man
33.1%
aged dep. 2021
▲ was 24.9% in 1991
Jersey
27.1%
aged dep. 2021
▲ was 20.1% in 1991 · still below UK
Guernsey
~34%
aged dep. 2021
▲ dep. ratio 57% vs UK 56%
UK benchmark
29.5%
aged dep. 2021
IoM & Guernsey exceed · Jersey below
Isle of ManJerseyGuernseyUK (dashed)65+ as % of 15–64
The key pattern: IoM's ratio was higher than the UK through the 1970s–80s, fell sharply as the finance sector boom attracted working-age incomers, and is now climbing again as that cohort approaches retirement.
All four islands together works best on a wider screen.
On mobile you've got the full dual-island view with animation — island pyramid, difference strip, and comparison pyramid stacked vertically. The quad view is here if you want it, but expect some scrolling.
Reading the pyramids: A healthy growing population looks like a triangle — wide at the bottom. The UK shows a barrel shape — bulging in the middle. The Crown Dependencies tell a different story: a Grecian urn.
The base is narrow because young people leave for university and don't always return. The waist pinches at working age. Then it widens again in the 50s and 60s — that's the finance-sector cohort who arrived in the 1990s and early 2000s, now ageing in place.
This isn't about current immigration. It's the echo of decisions made 20–30 years ago, now showing up as a structural dependency problem. In side-by-side mode, the centre panel shows the difference between the two selected populations per age band.
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Island
Comparevs
Year
2021
SpeedSlower
19962001201120212026~2031~2041~
Side by side + diff: The centre panel shows how the two islands differ at each age band. Animate to watch the differences evolve across 1996–2040.
Years marked ~ are projected estimates — Jersey uses its own official Population Projections 2025-2080; Guernsey its own Annual Population Projection Bulletin 2024; UK uses ONS principal projections. Not census data.
IoM's 2026/2031/2041 years are different from the others: no official Isle of Man population projection exists (confirmed independently against the Statistics IoM Population Report 2025 and the Government's own housing-need evidence base). Instead of one invented number, the IoM scenario selector above lets you compare three outcomes built on the same real model: cohort-transition rates derived directly from the Island's own real census pyramids at 1996, 2001, 2011 and 2021 (comparing the real population in each age band at one census against the real population one band older at the next census). These rates are net of both mortality and migration exactly as the Island experienced them — a census snapshot can't cleanly separate the two.
Historical trend uses those rates as-is. Recent trend adds the confirmed 2022-2024 average net migration (600/yr) on top — and lands within a few hundred people of the Government's own official OAHN housing-need baseline (94,000 by 2041), an independent cross-check rather than a fitted match. Target back-solves the migration rate needed to hit the "Our Island, Our Future" Economic Strategy's own ambition of 100,000 by 2037 (~1,087/yr, nearly double the recent confirmed rate) — shown as the stated policy goal, not a forecast; it was a contested policy at the time, and government's own 2024 evidence base already concluded it's off track.
One disclosed simplification: the male/female split within each age band is held at its real 2021 ratio for all three future years, since no age/sex-specific migration or mortality data exists to project the split independently. This same cohort-transition model (not a separate methodology) also drives the population panel on the Isle of Man Government Pension Explorer.
The four groups: Pre-school (0–4), school-age (5–14), working-age (15–64), and retirement-age (65+). The last group is growing fastest. The working-age share — the people whose taxes fund public services — is shrinking across all three islands.
Year
Island
Isle of ManJerseyGuernseyUK2011 census data
Compare 2011 vs 2021 to see the working-age share shrink and retirement-age share grow across all islands. The shift is sharpest in IoM and Guernsey.
What happens next? Jersey, Guernsey and UK projections are from official published sources. The Isle of Man has no official projection at all, so instead of picking one number, this page shows four scenarios built on IoM's own real 1996-2021 census cohort behaviour: a Historical trend (no migration adjustment), the Government Actuary's own Actuarial Assumptions (300/yr, from the National Insurance Fund's 2023-GD-0005 review), a Recent trend (confirmed 2022-2024 migration continuing), and the Government's own stated Target of 100,000 people by 2037.
A real result, not an assumption: the higher-migration scenarios show a lower dependency ratio than the historical trend, not a higher one — because IoM's migrants arrive overwhelmingly working-age (25-49), which grows the workforce faster than the retired population grows. That's the actual mechanism the Government's own strategy is relying on. It also means the "no migration" historical case is the one with the worse dependency ratio outlook, not the reassuring one.
The 100,000 target: from the "Our Island, Our Future" Economic Strategy, approved by Tynwald in November 2022 — an explicit ambition (~1,000 net inward migrants/yr for 15 years), not a demographic forecast, and one that proved contested at the time. Government's own 2024 Objective Assessment of Housing Need (OAHN) evidence base already concluded it's unlikely to be met on current trends, with a baseline of around 94,000 by 2041 — which lines up closely with this page's own "Recent trend" scenario (93,558 by 2041), built independently from real cohort data rather than fitted to match.
Island / scenario
2021 ratio
2040 projection
Basis
Source
Isle of Man — Historical trend
58.7%
57.1%
Real cohort transitions, 1996-2021 avg., no migration adj.
Modelled
Isle of Man — Actuarial Assumptions (300/yr)
58.7%
52.1%
GAD's own NI Fund migration assumption (2023-GD-0005)
Modelled
Isle of Man — Recent trend
58.7%
48.0%
+ confirmed 2022-24 avg. net migration (600/yr)
Modelled
Isle of Man — Target (2037)
58.7%
42.7%
Back-solved migration to hit 100,000-by-2037 policy goal
Policy target
Jersey
52.0%
58–64%
Net nil / +400 / +800 migration
Official
Guernsey
55.0%
~69%
Central (net +150/yr)
Official
UK
56.0%
~62%
ONS principal projection
Official
Jersey scenario
Isle of Man (scenario selected above)JerseyGuernseyUK
Jersey: Statistics Jersey Population Projections 2025–2080 (Feb 2026) — official.
Guernsey: Annual Population Projection Bulletin (Jun 2024) — official.
UK: ONS 2022-based national projections — official.
IoM: no official projection exists. All three IoM lines above are modelled from the Island's own real 1996-2021 census cohort-transition rates (see Pyramids tab methodology), not from Jersey/Guernsey/ONS methodology, and not from Cabinet Office projections (none exist).