+1 on cranking up the preload. Works for me as I run my Tracer soft. 20 some clicks to the firm and the bike goes right up on the center-stand.Start by raising the bike as high as you can, by cranking up the preload to max (release it once on the stand if going to hibernate). Same with tire pressure, Also remove box/panniers or any weight you might have on the bike.
With an aftermarket shock and proper sag, this bike will "roll" into the centerstand with minimum effort.
Tires can make a difference though. Easier to jack on the stand with new "pointy" type tires than old worn rounded ones.
It's not all because of age.