I was 13 too young for working papers and not much for baby sitting so I sealed blacktop driveways for the summer. REALLY! It is a lot of back breaking strenuous work but I loved it - all except the clean up. The hotter the better so i wasy usually working in shorts. the tar would splatter onto my shins and only kerosene got it off - along with the flesh! But I made great moeny for being 13!