If you can financially handle it, then by all means go for it. To me there is nothing more stimulating, interesting, fun, etc. than traveling and seeing and experiencing things. It is the dream of me and my wife to do it. We are mid 50ish. There are many places in my own state and within a few miles of my own house that I haven't seen and would love to see and experience. I don't understand how people can retire and just sit stale in one area. I want to see it all.
If you get an RV, get a simple, well-built one. If you get too old to travel, you can find a park somewhere to put it permanently - maybe, for example, a pretty park in Florida for those 55 and above. When I get older, I don't want a lot of house and yard to have to worry about; I'm trying to ged rid of mine now.
Travel, travel, travel. There is so much to see. Forty years ago, my grandparents, my mother, my sister, and I went on a three-week road trip to the western U.S. We went to all the national parks, old silver mining towns, etc. I will never forget it; to this day it inspires me thinking about it and seeing photos. And it was not only the attractions such as those just mentioned that were memorable, but also just the scenery and experiences we had the whole time. Just riding and looking out the window was fun. I want my wife to see the west.
We both want to do a lengthy tour of Florida; we want to start at the top of one coast and travel the entire coastline - all the way down and back up the other side. Then, after that, we want to tour the interior. There is much to see and do there, too. The U.S. has a very diverse landscape and geography and much interesting history and culture. There is so much to see - New England, the Outer Banks of NC, the midwest farming region, etc. There are also many off-the-beaten-path small towns with interesting histories.
I agree with you; you only live once. Don't spend the time you have left in a stale and uninspiring environment. Get out and see everything you can. Go til you can't go anymore. Then retire in a park and spend your days reading, walking to the beach (if you can), etc.
Sometimes when I stop at travel centers off interstate highways, I watch the travelers and wish I was on the road. I especially watch the older folks with RVs and I envy them. They always seem to be happier and more into life than the older folks I know who just get up in the morn and spend their days in the same old place living out their days. My wife and I often observe with envy the RVers who park overnight in WalMart parking lots. They seem to be having so much fun; it seems they're on adventure.
So, again, if you can make it financially, go for it.