I also had one when I was "out of the age group".
If you had a fibroadenoma, you had a non-cancerous tumor (scary word, tumor, but remember..it only means "growth") composed of glandular and fibrous tissue. <-- a hard lump in your boob that wasn't cancer! Phew!
Still....your boob, not mine, so easy for me to say phew, right? If you have lingering questions you should go back to your dr. If s/he makes you feel bad for asking, you have the wrong dr.