My parents did it several years ago. Both my parents are 82 and my mom did not want to go at all. She ended up having a great time. They flew in to Vancouver then took the boat up the coast from there. They went in late August so it was rainy/chilly the closer they got to Alaska. Think it was 4 or 5 days on the boat, then another 4 or 5 in Alaska taking a train from Anchorage up towards Mt Denali where they stayed.