Well, if you're not going to count being born in a time when there were no child labor laws...

It was a summer job. I was an "assistant" groundskeeper for the community I lived in. Assistant meaning that I, and one other person, did the work while our supervisor rode around in an air conditioned truck. Mostly painting hot, concrete tunnels on paths, raking, & a little lawn mowing. May have lost 10-15 pounds that summer. Ahh, memories.