Grip strength as a measure of aging has been known about for a long time. I was working on research with a gerontologist 10 years ago and he told me it was one

Grip strength as a measure of aging has been known about for a long time. I was working on research with a gerontologist 10 years ago and he told me it was one of the most reliable measures he used in his practice for telling when someones muscles were deteriorating (sarcopenia). You can buy grip strength meters that are relatively inexpensive: https://www.amazon.com/Handeful-Dynamometer-Measurement-Electronic-Strengthener/dp/B08X4JQDJZ https://www.amazon.com/Handeful-Dynamometer-Measurement-Elec... We built a Bluetooth enabled one for him to use in his research.