I was not able to save until my kids were grown and out of college with real jobs. And I did not make anything when I sold my cond,o and I had no pension, but I did work two jobs (one was half-time college teaching, for quite a few years, so was able to save money in my 401 K. I did not quit my regular job and start collecting SS until I was 69. I continued teaching for the first 9 years on the road, so that paid off my rig and kept me in the black. Repairs always took up my RMD, but I never really had to dig into that 401K. In fact, I still have not had to take much out since I quit teaching online--and the fund still catches up every year. (Fingers crossed.)
Working two jobs for 22 years, and then for 9 years of traveling was a pain, as was working until I was 69, but it really helped me financially. I have known a few people who started out full-timing with unrealistic expectations on how cheaply they could live, and not taking into consideration medical insurance costs when they were not old enough to get Medicare. Most of them quit traveling.
And, in fact, I think teaching half-time until I was 78 really kept my brain alive. (At least I think it is still alive, but if it weren't, I probably would not notice anyway!) Ditto for handling my motorhome and continuing to travel keeping my body in better shape than if I had spent those years sitting in front of the TV in my recliner in my old condo!! On the other hand, I am getting a bit old, so I am thinking of buying a condo and retiring from full-timing in about a year--sooner if interest rates and prices get a little better. Being in good health is what really makes us wealthy.