How old is the rat?

By August 27th, 2023, the mice born in 1936 were 87 years old, 88 years old in nominal age, 75 years old in nominal age and 76 years old in nominal age; the mice born in 1960 were 63 years old and 64 years old in nominal age; and the mice born in 1972 were nominal age.

1996 The rat born in 1996 is 27 years old, and the nominal age is 28 years old; Rats born in 2008 have a nominal age of 15 and a nominal age of 16. Rats born in 2020 are 3 years old and 4 years old respectively.