I think with age you are less open to being tickled but the ticklishness is still there just kinda dormant waiting for someone to find it again.I recently had a few dates with a woman who was 51yrs and one nite I started tickling her feet and she went nuts and laughing like crazy later she told me she forgot how ticklish her feet were since it was along time since anyone had tickled her.So being ticklish has no age barrier just the fact as we get older the tickles are far and between.

haha



