Let the son’s age be \( x \). The father’s age is \( 7x \). After 5 years, the son’s age will be \( x + 5 \) and the father’s age will be \( 7x + 5 \). The sum of their ages after 5 years is given as 50:
\[
(x + 5) + (7x + 5) = 50.
\]
Simplifying:
\[
8x + 10 = 50 \quad \Rightarrow \quad 8x = 40 \quad \Rightarrow \quad x = 5.
\]
Thus, the son’s age at present is 5 years.