I'm late 40s and started Judo last year ...Coincidentally, I have watched overview videos of Judo. I am interested in this martial art. Being in my mid 40's assume that I'm over't hill in terms of starting out.
What I like about our club is we do about a half hour warm up with specific exercises for the sport and at the end a good 20 minute or so warm down with stretches specifically for the muscles used. This means you're not crippled the next day.
First week, first lesson was about how to roll and how to fall properly. My second week, the beginner Coach wasn't there and I just mucked in with everyone else (mostly black belt) which wasn't at all like being thrown to the lions - they were very supportive, instructive and encouraging, but still threw me around.
Of course, COVID has put a proper crimp on close-combat sports. Some sports are starting up again in some areas, some have specific limitations imposed by their governing body. Get in touch and see what's what ...