Brother seriously misses/ needs his Dad?

..How do kids who grow a mustache/beard look bad it's growing up ever thought maybe he doesn't want to shave it and wants to let it grow. Honestly no one ever taught me anything about shaving or puberty I learned on my own I never had anyone to go to with questions so I studied the male & female body threw books and information online.. If he's stubborn that he doesn't want to know anything becuase his dad isn't there to teach him then let him be sooner or later he'll want to shave and have questions and he will have to use deodorant sooner or later