It depends where you are. Look around. What do you see? what do you see that needs to be done? who would care?
raking leaves can translate tto picking up garbage infront of your store, sweeping the sidewalk, cleaning the parking lot of debris ;walking dogs is serious work in bigger metropolitan areas
I knew a guy who crossed America on a bicycle, then he bought a bucket a mop thing and a squeegy and went down the street in the Lombard district asking to wash store fronts- after doin this and being consistent, Pepples Pies asked him if he'd be the manager- so don't worry- if you do a good job, the job you do will change, just do your best at whatever you are doing-
if you just want money, study outsourcing and Tim Ferris and his 4 hour work week; you might be able to get something going- and no one will know how old you are.
I did lawn work at 13, newspapers after that, pet care and feeding, bake sales