When I'm 84

There's an old guy at the gym.  Always sings, always singing 1950s era songs.  I suppose it's not surprising, probably the days he remembers most fondly.  But it got me wondering: what will I be singing to myself in 40 years? 

Old guy singing Tony Bennett is one thing, old guy singing Sigue-Sigue Sputnik just wont seem proper.  Then again, maybe it _will_ by then.