My younger kid has had a lawn biz since he was 10. Both my kids also paid for their own cars.
I had four yards I cut when I was growing up. I loved to build model ships. One yard would pay for one ship.
Come to think of it a grass cutting business today wouldn't be to bad!
I had a friend in high school back in the 80’s who had a lawn cutting business. He sold it for 18,000 when he went off to college.