im 26 and all the people i rode with were like 15 and i work in the motor trade, people i work with saying 'grow up get a car' etc, but i rode for the enjoyment (as i assume everyone does) but i gave up sold my bike.... but missed riding so building one again...... i could of stopped for any of them reasons and 1 did make me stop but im starting again even though im not very good, im old, no-one really to ride with.... BUT I DONT CARE!! i wanna ride....
i guess if you dont wanna ride anymore or something crops up , for what ever reason/problem it is..... you quit
but if you love it you carry on no matter what life throws at you