i have 3 cats the youngest is 4 (april 29th) and still bites.
as for only biting if taken from mother too early, the"beast" as i like to lovingly call her was hand reared by me!
she attacks me all the time.
my mom is friend but me hates me, i saved her life her mother got sick and could not feed her so i sat up for 3 weeks and did the job (all aspects on raising a 3 week old cat)
she is getting better but have been told that if i had been firmer with her she would not be quite so wild (i was also told that hand reared kittens would be more calm)
keep trying the toy thing never give up!!!!!!!