It's not easy getting older. The bones start to creak, the hair falls out and things that shouldn't be drooping droop. Turning 40 isn't easy, but that doesn't mean it can't be funny, so try out some of these 40th birthday gag gifts and bring a smile to wrinkly faces across the country. Why not add a little levity to a 40th birthday party with some hilarious over the hill gag gifts. The Old Fart Farting Slippers will give the birthday boy something to blame besides the dog. If his eyesight is going, give him some oversized playing cards so he doesn't embarrass himself by trying to create a Royal Flush with a pair of twos.