I’m 55 and just started riding again after 35 years off - similar situation to you. I also live in Colorado, have a nearly new 2016 WR250F, and same inseam. I got the same lowered seat, dropped the forks 10mm in the clamps, and installed this link: http://www.motorcycleloweringlinks.com/index.php?content=yamaha-lowering-link. Works perfect for me and my trails here in Grand Lake. Inspired so much more confidence with a bike that feels like it fits.