Cats are older than you think

Algebra

Experts typically agree that the first two years of a cat's life are equal to the first $25$ years of a human’s. After that, each additional year is equal to approximately $4$ years.

Grey has currently survived for $10$ years and celebrated this milestone by getting many boxes. What is his equivalent human age?

57 human years 14 human years 70 human years 10 human years 40 human years 82 human years 53 human years