When I was a kid I was a soprano but my voice has been going steadily lower as the years go by!
I've been singing tenor for about 12 years now; when I started women didn't sing tenor. But now there's quite a few of us. I still get women who come up to me, saying that alto is too high but they're nervous about singing tenor with the "guys". I always tell them that they should sing wherever their voice feels comfortable. If it happens to be tenor, great. Lord knows choirs can always use tenors, right? LOL