Some changes have come out since YouTube changed their rules to comply with the FTC/COPPA rulings.
There are a couple videos going over the changes and what it means to people in the YTPC who make videos not intended for audiences under 18.
One of them is from Big John Lofland which you can see on brtv.
Another is from Yardism. This is a very good video and all content creators in the YTPC should watch it.