That's almost true. I said natural selection only impacts odds of reproduction but there's a few things that occur after reproduction age in a population that have been studied to be naturally selected tooo

Behaviours of gays and the elderly are selected for to an extent because they help raise children in the tribe/community/group whilst not affecting reproductive pressures

Improving survival odds through nurturing children/others leads to groups with those genes doing better, which selects for those genes via natural selection

If the older members of the group are fitter and can help gather food/hunt then those genes are selected for too through increased survival of their offspring