Not a shock.
If most men had their druthers, this is how it would always be. Most would know better than to say that in mixed company.
DNA
Wide age gap is how DNA works. It is just how nature built us. Ages 20 & 18 there is little benefit to passing genes.
Ages 60 & 16, a long 60 years fighting off disease, building immunity, is passed off through to DNA.
If you survive tetnus disease, never immunized, pass that to a child, they are selectively stronger.
But sorry ladies, you stop having children at 35. So actually 70 & 35 are ideal ages.