What's the right age to let your kids start dating?

in this century , even if you say 18 or 21 is the right age , no one will follow. But of course ,i hope my child can start to date after he finish his studies . Personally when i enter secondary school i got into relationship and now thinking back its a waste of my time 😅 But of course i will encourage my child to start when the time is right but definitely after completing his basic secondary studies.