22
Detail
Let the present age of his son is x
So, the present age of his father = X+24
After 2 years, the father’s age become (x+24+2) years and Son’s age will be (x+2).
Now, according to question,
x+24+2 = 2*(x +2)
Or, x = 22 years.
Son’s present age = is 22 years.