If I find that I am wore down at any point I can drill instead of rolling with the 25 year old SOF guys or former wrestlers ( or both, the worst combo for an old guy).
I would look at BJJ instead of Judo. Judo is a great art however, it is brutal on the body. I started Judo at 35 and had a hard time being able to train much else just do to the pounding from the throws. At 45 I wouldn't dream of it. I do BJJ a few times a week now. I can do pretty much whatever I want along with the rolling. If I find that I am wore down at any point I can drill instead of rolling with the 25 year old SOF guys or former wrestlers ( or both, the worst combo for an old guy).