73? A baby! A child! I was born in 72. So, as your elder I will say that I never had a muscle bike either. I got into them from the restoration side. Something cool for my kids that just grew with a mind of its own. My thought: Build what you like. One of my muscle bikes will have some suspension, but the way it's used doesn't make it an off road bike. So, depending on what you want to do, you can decide the category. Just because you're not into muscle bikes doesn't mean you can't build your version of one and love it.