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    ← Reference index

    Biological age estimate norms

    A lifestyle-weighted age estimate with every weight published.

    Each answer carries a fixed weight in years. The offsets are summed and added to chronological age. Nothing is hidden and nothing is fitted to you individually.

    Smoking

    AnswerYears applied
    Never smoked-1.0
    Former smoker+0.5
    Current smoker+4.0

    Weekly moderate activity

    AnswerYears applied
    300+ minutes-2.5
    150–299 minutes-1.5
    1–149 minutes+0.5
    None+2.5

    Typical nightly sleep

    AnswerYears applied
    7–8.5 hours-1.0
    6–7 hours+0.5
    Under 6 hours+2.0
    Over 9 hours+1.0

    Vegetables and fruit

    AnswerYears applied
    5+ portions most days-1.5
    3–4 portions most days-0.5
    2 or fewer portions+1.5

    Alcohol

    AnswerYears applied
    None-0.5
    Up to 7 units a week+0.0
    8–14 units a week+0.8
    More than 14 units a week+2.5

    Waist-to-height ratio

    AnswerYears applied
    Below 0.5-1.5
    0.5 to 0.6+0.8
    Above 0.6+2.5

    Social connection

    AnswerYears applied
    Frequent contact, feel well supported-1.0
    Some contact+0.0
    Rarely in contact with others+1.5

    Perceived daily stress

    AnswerYears applied
    Low-0.8
    Moderate+0.3
    High most days+1.5

    Sources

    • Li Y et al. Impact of healthy lifestyle factors on life expectancy. Circulation, 2018.
    • Loef M, Walach H. The combined effects of healthy lifestyle behaviors on all-cause mortality. Preventive Medicine, 2012.
    • Holt-Lunstad J et al. Social relationships and mortality risk. PLoS Medicine, 2010.
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