Current age of father - 38 years
At the time of his boy's birth, father age - 19 years
If, current age of boy - 19 years
19 + 19 = Current age of father i.e 38 years.
Age of boy five years back = 19 - 5 ==> 14
So, son's age five years back will be == 14 Years
Ans :- 14 years