More exactly, if i need to renew it in case i go overseas?
Yes, you must renew your non-driver ID card if you are planning to go overseas. You can do it through mail.
Ok. I'm turning 21 soon, so i was wondering if i won't have any problems renewing my ID before that date or if must wait until i turn 21?
Well, in case you go through renewal for at least forty days before your birthday, you'll be issued a non-driver ID card with the words UNDER 21 on it, near of your birthday date.