Thinking is never good, just leads to trouble.
I’ve done many things that make me wince, even 20 or 30 years on I screw up my face at the memory of whatever I’d said or done. They say that youth is wasted on the young, I think it’s more that experience is wasted on the old. The knees are too weak to take advantage of all that previously gathered intel.
Everything’s a learning experience, and as I think back to when I thought that I was so right and arguing that very point while waving my arms around, I see how I could have played it better, and that maybe I was only 80% right as well. 70% at the very least. Of course, experience doesn’t just tell you how to avoid mistakes, it tells you from those very same incidents just how to annoy and antagonise people efficiently, so every embarrassing occasion in your past is actually a win/win in reality.
So when Rob Halford was shrieking “You don’t have to be old to be wiiiiiiiiiiiise!!!!” he was wrong and he was right. Youth is getting to the summit without breaking sweat and sticking a middle finger up, age is getting to the summit a little out of breath, but at the same time, by a different route after an extra hour in bed.