There's a couple of humourous songs sung by the late David Parry that come to my mind. One is a song called "Greezy Mac" about an older man who consideres himself a 'bar-maid connoiseur'. The other one is (I believe) a Robert Service poen that David put to music called "I wish I was eighty again." Actually, Robert Service wrote quite a few poems about getting old or being old; some of them funny, some not.