You can make big "cash" money mowing lawns.
You will never make any money working for other people unless you have some school, but even then you have to make them money before you get what you've worked for in the first place.
I'm a self employed Electrician and love it.
However, it took me 5 years of school and working for someone else to learn how to work.
Did you ever see an out of shape landscaper? They look like there 25 when there 55.