Lung Age Calculator From FEV1, With Predicted Lung Function

How lung age is calculated

Lung age is the age of an average healthy non-smoker with the same FEV1 and height. Morris and Temple published the formulas in 1985.

Men: 2.87 × height (in) − 31.25 × FEV1 − 39.375 Women: 3.56 × height (in) − 40 × FEV1 − 77.28

A lung age well above your real age usually reflects smoking damage, which slows when you stop smoking.

How accurate is a life expectancy estimate?

It is an average for everyone your age and sex. Your own health, habits and family history can move it by many years either way.

Is PhenoAge the same as an epigenetic clock?

No. PhenoAge uses routine blood tests; epigenetic clocks use DNA methylation. Both were developed by Levine and colleagues.

How can I lower my risk of falling?

Strength and balance exercise such as tai chi, a medicine review, eye checks, safe footwear and removing trip hazards at home.

What is a normal walking speed for older adults?

About 1.2 to 1.3 m/s in the 60s and 70s. Below 0.8 m/s is considered slow.

What is a good Barthel score?

100 means fully independent in the 10 activities. Under 60 usually means significant help is needed.

US Social Security Administration. Actuarial life table, 2022 period life table (2025 Trustees Report).
Levine ME et al. An epigenetic biomarker of aging for lifespan and healthspan. Aging 2018;10:573–591; Liu Z et al. PLoS Med 2018;15:e1002718 (and correction).
Morris JF, Temple W. Spirometric "lung age" estimation for motivating smoking cessation. Prev Med 1985;14:655–662. Quanjer PH et al. ECSC lung volumes and forced ventilatory flows. Eur Respir J 1993;6 Suppl 16:5–40.
CDC. STEADI: Stay Independent brochure. Morse JM et al. A prospective study to identify the fall-prone patient. Soc Sci Med 1989;28:81–86.
Bohannon RW, Andrews AW. Normal walking speed: a descriptive meta-analysis. Physiotherapy 2011;97:182–189. Studenski S et al. Gait speed and survival in older adults. JAMA 2011;305:50–58.
Mahoney FI, Barthel DW. Functional evaluation: the Barthel Index. Md State Med J 1965;14:61–65. Shah S et al. J Clin Epidemiol 1989;42:703–709.
Morley JE et al. A simple frailty questionnaire (FRAIL). J Nutr Health Aging 2012;16:601–608. Searle SD et al. A standard procedure for creating a frailty index. BMC Geriatr 2008;8:24.
Kivipelto M et al. Risk score for the prediction of dementia risk in 20 years among middle aged people. Lancet Neurol 2006;5:735–741. Tombaugh TN, McIntyre NJ. J Am Geriatr Soc 1992;40:922–935.