But perhaps there’s social factor, like a better ability to protect offspring would pass traits down after DNA transfer.
If we consider grandparents, they could.
E.g. more fit/older grandparents -> more help and experience sharing for raising the kids given to the parents, more infants survive. This would chose for lineages where grantparents are helpful && live more.
What I meant though is that the main evolutionary pressure of us in in reproduction. Sure some past-reproduction-age traits play a role, but hardly as big.