Ternary joke

There is more than one answer, which can be 2 1 year, 42 years old and so on.

First of all, we need to know how to convert 10 into ternary, such as 2 10 (ternary). If we change it to 10, it will be 2*9+ 1*3+0=2 1.

So let's make an equation for your problem, and let the decimal age be ab(a is ten digits, and B is every digit).

So we can get the equation, a* 10+b=a*9+b*3+0, which leads to a=2b, so there is more than one answer.