1 . Injuries . My body has gone through quite a bit of wear and tear in the time I ' ve been grappling . I can ' t imagine what it will be like to roll out of bed and train in my 40 s and 50 s . I ' m not at that point now but if my body is constantly deteriorates to the point where normal life stuff is severely impacted , I could see myself moving on to Muy Thai or even sparring more boxing rounds . The interesting thing is that I suffer significantly less injury training Judo and Wrestling than I do with BJJ . 2 . Family responsibilities Years ago , I trained with a guy who was GOOD . He was very strong and he had a knack for grappling . He quit because he felt he was missing out on his kids growing up , so he stopped training and never came back , and never regretted it . I thought he was insane at the time , but now I understand .