My DH and DS (17) are driving up to Scotland next week to climb Ben Nevis. I hadn't really given it much thought but I mentioned it to my mother and sister today and they were absolutely appalled. They said it was very dangerous and DH and DS shouldn't be attempting this by themselves. DH and DS don't have any experience of climbing mountains. DH (55) is relatively fit, keen cyclist and runner but DS is unfit, typical teenager spends most of his time gaming and has done absolutely no training for this. I've done some googling and there seems to be some pretty mixed information, some sources saying it's dangerous, some saying it's fine. Does anyone have any experience of this? Would they be foolish to attempt it? I feel quite worried now.