I just returned from a Quetico trip with my 60 year old sister, her first wilderness trip. We went in the Baptism creek entry and base camped at the island at the south end of Trousers, a strenuous trek- especially with the beaver dam in the middle of the longest portage. She did great. It all depends on your shape, attitude, and level of difficulty. I am 65. No problem, just a little slower than I used to be. I was once at the Sue Fall end of the Lerome entry when two guys in what looked to be their eighties came tooling up asking about the wall paintings in the area. As they paddled away, I found myself thinking, "Yes, that is what I am going to aim for!" My sister leaped off the 14' ledge into the water will the rest of us.