Mine's 45, I'll be 31 in 2 months. I think my max is somewhere in the low 190's, but this is just conjecture based on looking at formulas and seeing how I feel at different levels. My hr can get high quickly. How quickly it drops seems to depend on what I was doing (cycling vs. running), how long it was elevated, and whether I'm stressed, happy, tired, feeling good, etc . . . Just got the hrm a few weeks ago, so I'm still in the learning stages.