As I've mentioned in my original comments, even with my misread, I don't think being 80 or splitting the group in itself was necessarily wrong or negligent. Without knowing what kind of gear the kids had I still question their choice to go on to summit once they saw the weather at treeline. If the grandfather didn't have the right gear I suspect the grand kids didn't either. The grandfather clearly made a lot of bad choices and pushed himself to far when he knew he was probably making a mistake. I don't find this situation to be negligent though as defined by the state for billable purposes. I think most reasonable people in this scenario would have made very similar choices and the majority of them would have probably made it back down without incident. I think the press sensationalized the incident focusing on Clark's age and the fact that young kids "abandoned him" on the mountain. I doubt most people saw the follow up articles and passed judgement without much information.
We hiked with our kids a lot. Both participated in the outdoor programs at their colleges. One went on to be a trip leader and got her WFR. The other does trail work. My kids aren't mountain rock stars but they didn't just fall off the back of the turnip truck either.
I may be guilty of youthism in saying this but there are very few 19 year olds who I would entrust a 14 year old in bad weather on Mt Washington. Nothing against my kids, but I wouldn't have trusted either of my kids at 19 in that situation. And they've each summited multiple peaks in the Presis and both had done a traverse up there long that age.
Maybe this 19 year old had sufficient training and experience to take care of a 14 year old up. I hope so. It would be pretty remarkable though.
Regarding the victims age... Walking 20 miles a few time a week in central Ohio is impressive. But, I grew up very close to that and it's not that impressive. It's not dead flat like up my Lima but it's pretty flat and on it's own wouldn't strengthen the proprioceptors and support muscles that give us good "trail legs". I think this is something that those of us who work out in gyms and on the road regularly and then go hiking understand well.
If this story had been repeated and everything was the same except the victim's age was changed to 50, I think those of in the hiking community would correctly point out that walking, while providing a great base for hiking, isn't the same has hiking the high peaks in the northeast. And hiking 3 high peaks in a few day's time is asking a lot in terms in terms of recovery. If his age was 50 and not 80, we would correctly conclude that he probably bit off more than his body could handle in terms of recovery time and a lack of deep trail fitness. Most of us have been there.
Muscle mass and recovery issues are more profound in 80 year olds than they are in 50 year olds. That's not agism. The same thing is true comparing 50 year olds to 20 year olds?
Age is definitely an issue here and walking 20 miles several times a week in central Ohio, while noteworthy, isn't enough to make age not an issue, particularly on the 3rd hike in a several day window. IMO.