My cat is about 2-1/2 years old. We just got her form the local animal control about 2 weeks ago. She was biting playfully at first (not hard) but I made my hubby stop playing with her with his hands so she wouldn't associate it with play. But I really dont' think it matters. She has now started after the feet. AND she is biting harder. She did this last night and I yelled at her good! Yelled "no" and while she was looking at my feet (she wants to play is all) I took two fingers pointed out to her and when she looked at them I brought them to my eyes. And said "eyes not feet!" Don't know if she will learn but it really seems like if we play with her she will stay away from the feet and hands but if we dont' play (we were real tired last night and didn't play much) she tries to instigate the play buy attacking feet or hands. If anything wiggles she thinks it is fair game. Maybe if they play with her more with other things like a stick with string or anything far away from their feet or hands then she will stop attacking them.. Also yell at her and maybe if you can tap her nose - not sure if she is being playful she will think you are trying to play when you reach for her and that is not good because she may swat or scratch.... Try the yelling loudly - they don't like it and playing with her some more with toys - that extend away form them... just ideas Debbie