Very true, once they hit 50 they realize they are a spring chicken anymore and once they get a glance of a BBC they tag it all night and sometimes in the early morn...
I know exactly what you mean, I've fucked 2 80 yr olds, a 75, 74, 72, 71, 2 70's, 3 66s and it was absolutely incredible. Sometimes as they get older they aren't as agile in bed but I benefitted from their experience and ability to give pleasure. My orgasms were very intense and deep as were theirs.