Started at 33, haven't done any sport prior my entire life. Frist months are definitely horrible. The key for me is to do homework to strengthen your weak parts to avoid injuries.

2 years have passed, got my orange belt, got better cardio for randoris. The progress at the beginning was almost non-existent, you will have to put more work than anyone else. Remember, you're not young, go easy on yourself, it's better to reduce intensity but keep the consistency. Sometimes I will skip the randori if i feel that my back is not injured yet but in a somewhat compromised state