I'm a 17 year old male with a comfortable range of D2- E2-E4-F#4 I've been working on my lower as well as the higher end of my vocal range and while I've gotten better at the highest end, just recently getting past E4 without straining, my lows seem unaffected and I can't seem to get any lower than that D2 (except, of course, in the mornings, when I can get down to an A#1 on good days and B1 on a daily basis, but they don't count).
So I don't really know if I'm gonna be stuck at this D2 forever or if there are hopes for me to get to a good C2 or even, hopefully, a B1 as I get older.