Question 1158671
Assigning n for the son's age, and following the description as written:
<pre>
Man         n+4n=5n
Son         n
Wife        5n-5
SUM        103
</pre>
This gives equation {{{5n+n+(5n-5)=103}}}.


{{{11n-5=103}}}
{{{11n=108}}}
{{{n=108/11}}}
{{{n=9.818}}} if to three decimal figures to right of decimal point.


n, son's age is  9 years 43 weeks.
Is that the kind of result you expect?