One of my best friends went all the way, and she started in her early 40s. And by all the way, I mean she lives without disclosing to anyone anymore -- as far as her professional colleagues and friendships are concerned, she's cis. And it's not like she's drop-dead gorgeous or anything (which is rare for women of a certain age), she just walks the walks and talks the talk and is smart as a whip, and compassionate as all get out.
Another dear friend transitioned in her late 30s, then in her early 40s met a wonderful man who inadvertently found out her history six months later, but at that point was so smitten that love prevailed. The married a couple years later, and are still happily together now in their fifties; she helped raise his kids.
So yes, it's totally possible. It's going to take a few years. It's a marathon, not a spring.
Keep up with the beard removal, and be prepared to switch to electrolysis when all the remaining hairs come in white. Most of all, make your voice training your highest priority, as of now. This will all take time. Don't worry about coming out or going full time for at least a year; in the meantime, build up your financial resources, figure out your makeup and fashion inclinations. Get started on HRT as soon as you feel ready -- I waited until six months of therapy, electrolysis, and voice practice. There doesn't have to be a rush.
You can absolutely do this.
