I did the same hike last August and it is a difficult hike for some of us over 50. It's all up in the beginning. The balds and ponies make up for it. And also, there's some very rocky parts where you just have ot watch where you're going. I ended up completing it, but not in the time I thought. I added an extra day because of all the climbing in the heat...little water so, I camped out in the trees somewhere. I would have bailed as well if my hips were in pain. As others have said, the downhill from White top is a killer.

I've learned to change my sleeping pad to the Big Agnes Core for that extra comfort. I don't know if you may have arthritis in your hips or if it is just not being in shape. As I am aging, I have noticed that I have to slow down now, take more breaks, fuel myself more often and make my campsite very comfy..that is, softer sleeping, washing up more, and yes, a hit of whiskey!
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I think you did a wise thing and there is no shame in getting off the trail. That area is gorgeous and you witnessed the best part.
Hiking 'gracefully' is just as much fun.