I found I had posted on the 1st page in 2015. I'm 74 now and do get tired a lot sooner than when your younger but I still plug away at it. I've been working on my layout for years and now I'm not sure I'll ever reach the starting scenery stage. I think I was too ambitious when I first designed it. Open grid with sawn out roadbed. A table top type sure would be faster. I have so many trains I have quit buying altogether and should sell some.
I recently took up slot cars and became enthusiastic about them and am building a track. Designing, tablework and track work is similar to model railroading.