I'm almost 40 years old and take BJJ, 5 days per week and have been training 9 months but I don't roll every day as my body gets tired, knees hurt, shoulders etc. I'll roll hard 3 out of the 5 and just practice technique on the other 2 days. Lately the younger guys and the instructor has started busting my balls about coming down and not rolling. These guys are only 25 years old. I've been active my whole life and have always listened to my body when training. Should I just go tell them to kiss off??? as I know my body???