There is no easy answer to this issue for young or old. It all depends on what you are moving. Bigger wheels are generally better. Pneumatic tires, as Pat said.

At some point in my life, I had to stop being Super Man leaping onto small stages with a single bound...lol I had to hire someone to move heavy stuff and just say no to second-floor gigs. You may find it disheartening to discover that common moving labor is worth more than skilled musicians in all too many cases. OMG, I remember staircases in Holland that looked like ladders. I am lucky now if I can walk to the elevator...lol

Reduce the load by using modern equipment. Play and sing through the PA. Use Guitar Rig 6 instead of lugging a Twin Reverb around. Use a Mexican Strat instead of a Les Paul. Leave the spare repair parts and tools in the car. Be glad you are not a drummer.

Put a crash garde between you and all your gear in the van. It is a good idea not to get killed on the way to the gig.

Sure, I "want" a B3, three guitars, four hundred pounds of tube amps, a snake, and a sound man...well, and a couple of cute girls just for good measure. That ship sailed a long time ago for almost all of us...lol

The other answer is just don't ever get old. Live hard, die young!

Billy

“Amazing! I’ll be working with Jaco Pastorius, Charlie Parker, Art Tatum, and Buddy Rich, and you’re telling me it’s not that great of a gig?
“Well…” Saint Peter, hesitated, “God’s got this girlfriend who thinks she can sing…”