Ahh, the classics...

My nookie days are over, my pilot light is out

What used to be my sex appeal, is now my water spout

Time was when, of its own accords, from my trousers it would spring

but now I have a full time job, just to find the blasted thing

It used to be embarrassing, the way it would behave

For every single morning, it would stand and watch me shave

But now as old age approaches, it sure gives me the blues

To see it hang its withered head, and watch me tie my shoes!