as both of them are at their forties which means they are above forty then: we take an example of 41 and 43
1) the sum of the two ages is =84 then (41+43=84) 2)the product of the two ages is 1763 then (41x43) 41 x43 ------- 123 164 --------- 1763 .: his oldest parent is 43 yrs old