IMO you should take that as a warning to improve your health before it gets even harder and have a pretty bad time in your 60s and 70s. You should be able to c

IMO you should take that as a warning to improve your health before it gets even harder and have a pretty bad time in your 60s and 70s. You should be able to climb stairs with no problem in your late 40s and there are many who do fine in their 70s if they keep up their fitness. Like looks at this MRI comparing a 40 year old triathlete, a 74 year old and a 74 year sedentary man. Sarcopenia is a choice in many ways! https://www.researchgate.net/figure/Figure-Typical-quadriceps-and-hamstrings-Magnetic-Resonance-Image-of-a-40-year-old_fig1_338446940 https://www.researchgate.net/figure/Figure-Typical-quadricep...