48 here and a friend is 62, we’ve been going to the Alps for a few years now and thorougly enjoy it, you’ll be fine.
*I’d just get out and ride, you’ll learn basic skills just by riding, that’s how we did it 25+ years ago. Then when you’ve improved fitness and got some miles in, get some training to improve your skills.
*If you’ve not done anything physical for a while build up your fitness, I wouldn’t go in all gung ho as that’s when you’ll make mistakes and end up crashing and with injuries.
We don’t bounce like we used to, we have a running joke that we tend to risk assess every lip, jump, bump, mud, loose gravel and bit of rock now.
*Not an expert but all just my opinion 🙂