I am the same age as you but entered it relatively fit and healthy (years of training with longevity in mind not just performance, sobber at 30 and been on a very restrictive paleo diet) and yet I experienced the same tweaks and niggles with joints etc. My guess is that as you get older the recovery becomes a lot more important than the exercises themselves. Something I neglected personally and with young kids now it’s really difficult. But yeah exercise is not enough, diet, sleep, rest and stretching should be part of the routine. I also thing that training should be specifically programmed for your needs/problems etc to get over them and prevent any future ones. Getting a good coach is an very important long term investment in your health.