Ages Tuan ' s father = mn

Father's years of birth = pqzy

We have

\(mn\div2=p+q+z+y\)

\(a\times10\div2+b\div2=p+q+z+y\)

\(a\times5=b\times2\)

\(\Rightarrow a=2;b=5\)
So father age is 25

Father's age in 2019 is:

       \(25\times2=50\left(ages\right)\)

Father year of birth is :

     \(2019-50=1969\left(years\right)\)

So year of birth is 1969