A greylag aged 9 years 4 months is like a human aged 16 years 7 months
If a greylag is 9 years 4 months old, that is like a human aged about 16 years 7 months (accuracy ±8 months 2 weeks). The calculation uses the average and maximum lifespans and the age of maturity of both species, so the ratio is not linear.
How old is a greylag aged 9 years 4 months in human years?
About 16 years 7 months (accuracy ±8 months 2 weeks).
Why is the age not converted linearly?
Species age unevenly: childhood, maturity and old age take a different share of life, so the calculator matches the life stages of both species.
Can I choose another age or species?
Yes, the page has the calculator: pick the species, sex and age, and the result is recalculated.