How can someone under the age of 18 get involved in Affiliate Marketing?:

How can someone under the age of 18 get involved in Affiliate Marketing?

I’m in high school and I would like to get involved in Affiliate Marketing. I have done some research and find it entirely feasible, however I can’t seem to find any Affiliate Programs that accept affiliates under 18. Are there any programs that do? If not, what are some ways around this?
How about if I do it jointly with a partner who is over 18?