One man's f is another man's mp

I know that my voice is sort of on the large side--particularly for someone at my age. However, the true extent of how large it is kind of hit home last week, when I was being thrown around to different parts to try and equalize the balance in the choir. Mind you, this is a large chorus: there are about a dozen people on a part, even when singing an eight-part divisi.

[Allegedly, what I've read suggests that men's voices don't reach full capacity until sometime in the mid- to late thirties. I'm kind of worried about what that means for my own pipes. Am I going to have to scale down my voice just to fit in?]