Last verse:

When I was young and in my prime,
I can wee wee anytime.
But now I'm old and going grey
I can only wee wee twice a day.

It's a song we used to sing in the 1st Aldershot Venture Scouts in the 1970s which I 'collected' from leader Bob Norris from Ash, Surrey.

The tune and chorus was a version of 'rum and cocoa cola' which I think was Harry Belafonte or some other calypso singer.