I'll contribute my two cents to the discussion. I'm a somewhat youthful 68 (or do I kid myself?), am 5' 11", and have been cursed with a 29 inch inseam. I've also had my Versys for about three years and though it isn't as light as a 250, or my wife's Suzuki S40 thumper, it isn't yet too heavy to handle comfortably. It's certainly lighter than my BMW K75S.
My mounting technique may be amusing to watch but it works for me. It goes like this: I stand facing the saddle, lift my right leg and grab the pants cuff to "assist" my size 11 foot over the saddle, then I slide on. As I said, not elegant but it works, particularly since I have Givi V35 hard bags mounted and an Axio hard top tail pack on the passenger portion of the saddle. The bottom line is that I couldn't have swung my rather short leg over that rig 40 years ago!
With my inseam, and no lowering kit (yet) I can comfortably touch mother earth with the balls of both feet - so far so good I might add.
If the Versys had a center stand, I'd mount like my long time friend and mentor. He mounts his V-Strom like a horse. Places his left foot on the left peg, stands and swings his right leg over, then sits and rocks the bike off the center stand. It's become my default mounting method for the BMW because it also has hard cases and top box mounted. All I manage to do if I try the traditional "right leg swing over" is to kick something that wasn't meant to be kicked.
If the Versys doesn't feel comfortable to you and you're short list includes the sweet little Honda CBR250, you might also wish to take a look at Kawasaki's Ninja 300 - IMHO it's a very nice lightweight but peppy machine.
Successful aging requires adaptation!