Xiaole asked grandpa Zhang's age, and grandpa Zhang said, if you remove the ten digits of my age and add 18, I will be a 20-year-old boy. If you remove the single digits of my age, plus I am still a 20-year-old boy, how old is Grandpa Zhang this year?

The unit is 20- 18=2,

The decimal number is 20- 18=2,

Grandpa Zhang is 22 years old this year.