Heck, I'm old-58- so I use wider tires-2"- with 40 psi on mtb type frames.I -not the bike-just don't take sharp bumps as well,so I don't want to put up with the filling loosening that 120 psi on 23mm tires gives you.
Heck, I can't tell anything about the frame characteristics; It is all lost in my nice soft tires which is exactly what I want.

The most important aspect material aspect of the bike is when I have to lift it off the upper level of the bike rack-over 30 lbs is too much.
If I could afford it,I would love to have a Titanium bike. I like the skinny look of older steel bikes, but they never really "felt" better than other materials-not with 110 psi in the tires.
Charlie