Ten digits are only three digits lower than single digits, that is to say, ten digits are three digits lower than single digits, and the square of single digits is equal to his age, while thirty years old means that he is older than 30.

Problem solving process:

If the unit number is X and the decimal number is x-3, then the age is10 (x-3)+x =11x-30.

According to the unit square and the life symbol, the age is x square.

So the column equation

The square of x = 1 1x-30

The square of x-1 1x+30=0.

(x-5)(x-6)=0

X=5 or x=6.

X=5 years old, 25 years old

So x=6,

So the age is 36.

A: Zhou Yu died at 36.