This text comes from The Canadian Soldiers' Song Book, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
At seventeen he falls in love quite madly
With eyes of tender blue,
At twenty-four he gets it rather badly
With eyes of a diff'rent hue,
At thirty-five you'll see him flirting sadly
With two or three, or more,
When he fancies he is past love,
It is then he meets his last love,
And he loves her as he's never lov'd before.