I've been doing hub-and-spoke style tours since I was quite young, with my family. Travelling with our bicycles was completely normal.
Then, when I was 17, my father decided to cycle from Jasper to Banff in 3 days. We all came along, in the car and arranged accommodation and supported him, etc. Then I cycled the last day with him.
When I did that, I decided I would cycle from Jasper to Banff in 3 days too.
Several years passed, and then in 1994 I cycled my first century in preparation for that trip. Plus quite a bit of other cycling as well.
Then in 1995, when I was 28, I cycled from Jasper to Banff. I did the first 2 days, took a day off, and did the 3rd day. Now, it wasn't a loaded, self-supported tour. My husband at the time drove the van with the stuff, set up camp, and so on. But nevertheless, it was a multi-day tour.