I sang in high school choir and was missing it ever since when I finally started singing w/choir at our church. This led to a musical revue they put on every year and shortly after that the artistic director asked me and some of the other women from the revue/choir if we'd like to form an octet. We are still going strong 3 years later and have quite a repetoire, and we do performances about 1x/mo around the community. I do read treble clef, but am not the best sight reader so most of my learning is by ear. Reading music is not that hard though, and if you could learn a bit, that would probably help. As far as the voice changing, I started back as 2nd soprano but they eventually moved me back to 1st since there weren't many others who could at least somewhat sing high, but my voice isn't where it was back in hs. If you start to sing again I'm sure you will figure out the range that is most comfortable for you. Church/community choirs are a great place to start and meet others with the same interests. If someone had told me 5 years ago I would be doing what I am now I would never have believed it. It's not like I have this amazing voice or even all that much experience other than junior high and high school, I only studied voice about 1 year prior to audition for choir way back when. Getting out there and singing w/others who love to do it can lead to amazing things! Go for it!