Age 56, best procedure for tightened & sculpted upper arms?

I'm 56, healthy and workout regularly but my upper arms are sagging. Not a lot of fat (or extra skin to justify a long, unsightly arm scar) but would still like my arms tightened and sculpted, especially above my sagging elbows. I have some unevenness and possibly scar tissue from my last procedure. What would be the best procedure(s) to tighten, sculpt and slim my arms without long scars? It seems most tightening procedures alone would offer minimal results.