I'm in my 40s and never thought about hiking. I never did any sport either during my adult life.
Today, the idea of Hiking came to my mind. I was thinking "How many kilometers could I even do it?"
So I have put about 2 kg of stuff in my backpack and started walking through my city.
I really liked it for about 5 km. Then it was a chore. I did two more km and was very exhausted :)
How much better can I get at it?
It means that you too can do it, but start slowly. Simply start walking[0] and ensure that you reduce your overweight if you have some. Combine it with regular strength workout, maybe 30 minutes 2 or 3 times a week.
The most important part is that you must find your fun in walking. Find something interesting you (mapping, birds, architecture or simply thinking about stuff) while you walk.
Reinhold Messner used to quote one of his good friends: "Hiking is the art of suffering". So yes, you suffer a bit on the way and some people cannot stand it, some enjoy it.
[0]: https://news.ycombinator.com/item?id=31250001