I know of 4 friends (all undergraduate classmates now around 60), one of whom married for the first time in his early-50's, 2 others married for the second time in their mid-50s (both these guys became fathers of twin daughters from the second marriages in their late 50s) and the last guy got married in his late 50s for the third time. So, yes you can marry, remarry and re-remarry after 50 and continue to be alive active in all the right places - even if you are not a celebrity.