What year will I be born if ?

I just turned 20 on june 3. Yeah I know stupid question but I forgot. Sorry I dont know or understand much english. I slow. So please help me. You be most appreciated and rewarded the best answer. Some of you may think it a easy question but its hard when you came from a differ country with differ cultures, language, and stuff. So please dont try act like a smart A and please just help. Whats the answer.