Ask age jokes

Suppose Xiaohong is x years old this year.

If I were your age now, it would take you 40 years to be born. Grandpa is x+40 older than Xiaohong.

So grandpa is 2x+40 this year.

If you were my age now, I would be 125 years old.

Xiaohong won't reach grandpa's age until 40+x years later, so it is 2x+40+40+x= 125.

3x=45

x= 15

Grandpa this year: 2x+40=2x 15+40=70.