We started early in the morning on the Miners Trail and it was a breath takingly wonderful 3hr walk - it was quite steep towards the end and as it was just coming up to mid day a few people were already at the top enjoying their much rewarded snacks, as too did we, and glad that we bought some up with us as the cafe wasn't open! We decided to go back down via the Pyg track which wasn't as easy as going up, but still pretty straight forward, with wonderful views. Lots of mixed aged people doing this, so I think it depends on fitness rather than age. Remember to take lots of water and snacks and of course check the weather forecast. Oh and our 10 year old Patterdale managed this happily.