Answer:
there is no age limit for exercise, the more you do it, the more you are fit and chances of living longer
In order to show respect, you must focus on being kind, and generally be a good well-rounded person. Show your respect for them by helping them out with something, such as moving a piece of equipment.
A large part of respect for a facility, such as a gym, is respecting their equipment by wiping off sweat, and putting the stuff you use back in its proper place.
Hopefully, this helps! =)