Yes, but you call it a step thru (through) frame
How much does he weigh?
Does he need more than one speed? If he's weak it will help. Also reduces effort when accelerating from a dead stop.
You could also try a bike with "pedal forward" technology, the seat is lower, you can just about walk up from behind, straddle & sit. Single speed about $250. Check
this page, top to bottom. The men's in clay looks great in person.
If you can go more expensive the
7 speed is a nice bike, I wish I had one. Locally you'll probably pay over $400. I've seen them for $399-449 at the local bike shop. If you buy at a LBS they'll fix it if it screws up, around here 2 shops have a lifetime service on non-wear parts, so if it started rubbing like your Kmart ride did, they'd fix it.
My favorite See how the seat is lower & the pedals are moved forward compared to your bike.
