Other predictors associated with increased hazard ratio they noted were weaker hand grip strength, higher resting heart rate, sleep much less or much greater than typical, and lack of leisure time physical activity.
https://www.mcpiqojournal.org/article/S2542-4548(26)00017-2/fulltext
I wish they gave the pace they considered slow enough to be a predictor.
Some googling found this but the data is old:
Speeds ≤ 1.3 miles per hour suggest poor health and functional status.
A speed of 1.8 mph is the median walking pace for this population.
Speeds ≥ 2.2 mph suggest healthier aging.
Speeds ≥ 2.7 mph indicate an “exceptional life expectancy, but additional research will be necessary to determine this relationship” (Studenski et al. 2011).
Looks like “this population” was age >65.
I’m doomed. I do have a great hand grip, though.
I’m by a fast walker and my resting heart rate is low. But my grip strength has never been strong.
Ditto. I use a $3 plastic thingy to help me open jars but can cover over 3 miles in an hour quite easily. My husband, a decade older than me, might live forever… we walk together at said ^^ speeds, he can open any jars without the plastic thingy, and he was once asked by a doc if he was half dead because he had super low heart rate. 
H is constantly referring to this study and how I need pick up the pace. We walk 18 minute miles and he basically wants 15 minute miles. I’m glad to see the definition of the pacing. Feeling better already about myself. But, we both use a thingy to open the jars though.
H and I walk at least 5 miles 5 to 6 days a week. Like @rockymtnhigh2 our pace is about 17 to 18 minutes a mile. I think we are doing pretty well. I’m another one that does not have good grip strength.
I believe the same thing applies to driving as well. 
How does one judge grip strength? I walk fine though I’m not quite 65 but I wouldn’t know how to judge grip strength (I can open jars, though there’s often some banging the edges on the counter to loosen it).
I am a super slow walker, poor grip strength. But I constantly amaze my doctors because despite being appreciable overweight I have low blood pressure and a resting heart rate so low that they never believe it the first time and always redo the reading. So perhaps I’m also half dead like @BunsenBurner’s husband? 
Interesting. Especially how general strength training can help grip strength. Maybe there is hope for me.
I’m not going to bore folks about with the details, but strength training is a natural drug for your body.
There are so many hormonal responses such as testosterone, cortisol, HGH, endorphins, insulin sensitivity, etc. Also, chemical and physiological processes that keep us healthy or healthier.
So I need a special instrument to measure grip strength?
I’m OK to good on most things. The grip strength though… In some ways I am fine. I can hang from a bar forever, do pull-ups, carry a pair of 50lb dumbs around without issue, etc. A few months ago H saw something on YouTube where you palm a round kettlebell upside down (hand covers the ball part, not the handle) and hold it at your side for as long as you could. I was a lot better at that than I thought. I could do 15lb kettlebell for almost 60 seconds. I think H was only using 20#.
But what I can’t do? I can’t seem to grip/turn things with my fingers. I was trying to tighten the cable connection on the back of my TV, and I’m getting REALLY bad at that. It was a bit concerning actually. Not being able to see what I’m doing also royally ticks me off…
H has always had these gadgets around. I’ve never paid much attention to them, but I asked if I can take one to work. I can easily do a few sets there each workday. I’m sure it’ll be good for me. Edit - he just told me this is the easy one, and that he does sets of 50 with the hard one. I guess I ought to plan for more than 3 sets of 10, lol
My grip strength is good, but I have noticed my hand dexterity is changing. (I’m talking about the fine motor skills.)
I have a set of those. A few years ago, I started using them a bit while watching TV. Got spooked when my hands started hurting… but maybe that means I should have hung with it more?
