It depends what you mean by "grudge". If you mean "do I sit and brood about a problem that has passed long ago" then no. If you mean "do I maintain my attitude towards those who have wronged me in the past" then yes. Some people see that as "holding a grudge", which has a negative connotation. However, I see no reason why my opinion about someone or attitude towards someone should change merely because of the passing of time.