For myself at 78 years old and I still get around pretty good for an old man, I now give a lot more thought on my future projects. I started a 3x22' switching layout last year and I feel it will be my last layout at home, I do have access to my club layouts, so I'm not hurting for places to run my trains. I have a large home on 2 acres and it's about all I can do to stay ahead of the game, yes I can pay to have work done, but I have always been a hands on person and I enjoy doing things. So for me a many of days I need the heating pad, bath in the Jacuzzi, and the Ibuprofen. I wouldn't say it's not only model railroading, but just life in general at my age. Just do what you can each day on your railroad, so you can have some left to start again tomorrow.
trainman