A gannet aged 12 years 6 months is like a human aged 29 years 6 months

If a gannet is 12 years 6 months old, that is like a human aged about 29 years 6 months (accuracy ±3 months 3 weeks). It is not “multiply by 7”: the calculator matches life-cycle control points — birth, puberty, adulthood, average and maximum lifespan — and builds a conversion curve from them.

How old is a gannet aged 12 years 6 months in human years?

About 29 years 6 months (accuracy ±3 months 3 weeks).

Why is the age not converted linearly?

Animals age differently: for some, childhood lasts a month, for others a decade; some live to 5, others to 200. So the calculator does not multiply by 7 — it matches up to 8 life-cycle control points.

Can I choose another age or animal?

Yes, the calculator is right on this page: pick the animals, sex and age or birth date, even an approximate one, and the result updates.

How old will a gannet be in human years next year, in five years, on a milestone birthday? An exact curve with up to 8 life-stage points — for any pair of animals.