As for 16-17 being too old or not, I say NOT! Seriously- I ToT'd until the year I went to college. As long as you and/or your friends adhere to the spirit of the holiday (ie don't act like rude little punks, be sure to wear costumes, don't be greedy, etc) there shouldn't be a problem. Also I found that towards the later ToT hours (9pm-ish) people were likely to give bigger handfuls of candy to get rid of it!