Kudos to everyone who wants to get back to riding. I had robotic surgery last September when I was 56. I was back on the bike (Lemond) in five weeks. Started with very short rides, stopping frequently to readjust my Terry Liberator Y saddle. Increased distance slowly without much intensity. Did 25 miles before 3 month appointment. Rode 2-day, 200-mile Seattle-to-Portland in July. Bought a used mountain bike in May and now I'm having fun on that.
I had some soreness after I started riding for a few months, but I had soreness just sitting around anyway. Probably from scar tissue. I just kept it slow and easy. Now I feel as good as ever on a bike (I don't race. I just enjoy long rides). Actually, I don't have the urge to stop at every porta-potty anymore.