Social connection & life expectancy
Strong relationships are one of the most underrated longevity factors — on a par with quitting smoking.
Why it matters (the mechanism)
Connection lowers chronic stress, supports healthy behaviour and provides practical help in illness; loneliness does the reverse.
The evidence
A meta-analysis of 148 studies found strong social ties increase survival odds by about 50%; loneliness carries mortality risk comparable to smoking 15 cigarettes a day (Holt-Lunstad et al., PLOS Medicine 2010).
What to do
- Invest in a few close, regular relationships — depth matters more than numbers.
- Build routines that create contact: shared meals, clubs, faith or community groups.
- Keep ageing parents and family close where you can — a documented Blue Zones effect.
- If you feel isolated, treat it as a health priority and seek a group or support.
And the chance of reaching 100?
Your odds of reaching 100 rise steeply with your overall forecast. As an illustration, a forecast age of 85 implies roughly a 6.7% chance of reaching 100; a forecast of 92 implies around 21%. Factors like social connection shift where your forecast lands. Get your personal figure in the calculator.
These figures are population-average estimates from peer-reviewed research, applied on top of the official life-table baseline for your country, sex and birth cohort — the US Social Security Administration period life tables, the UK Office for National Statistics, and the WHO Global Health Observatory. They describe statistical tendencies, not personal certainties, and are not medical advice.
Other factors
Frequently Asked Questions
See how social connection and everything else combine in your forecast — plus your chance of reaching 100.
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