I’ve been married for 75 years.

Promised my wife when we got married that when two people quarrel, the loser has to walk for 5 kilometers.

I’ve been walking 5 kilometers every day for 75 years!

Everyone asked again: But how come your wife’s very healthy as well? The old man answered: I’lI tell you another secret.She’d been following me to make sure I really finish the 5 kilometers!