And they never looked like teens, or acted like them. Also, 20, 21, 22 is a lot different from 26-27- nearly 30. remember when Ron Howard played Opie as this little kid? Well, Ron grew & left the show, he was too old, too big to be "Opie" any more. And so....he became a teen, and very young 20 yr. old on Happy Days.......and has done so much more. Hey, he is now 70 yrs., done so much, but always used all he learned from the shows he was on.........