Human Equivalent (Cat and Dog Years)
http://en.wikipedia.org/wiki/Human_equivalent#Cat_and_dog_years
“One formula for cat years is based on a cat reaching maturity in approximately 1 year, which could be seen as 16 in human terms, then adding about 4 years for every year the cat ages. A 5-year-old cat would then be (5 − 1) × 4 + 16 = 32 “cat years” (i.e. human-equivalent years), and a 10-year-old cat (10 − 1) × 4 + 16 = 52 in human terms.”
Thank god someone worked this out.
(If math makes your brain hurt, try this instead.)
