Bluebug, I'm exactly twice your age and like the others have said, after a hard workout on the spinner (90 -120 minutes) I am wasted, but it never leaves me with soreness the next day.

Like the others, I think you are overtraining. Like you I'm concerned about over doing it, I have not trained so seriously in an off-season for years, and don't want to burn out by next spring or worse suffer an injury.

My last session was two hours of base building keeping my heart rate in zone 3 the entire time (not counting warm up/down). The next day, I did a very easy spin on the trainer for 60 minutes, never getting above top of zone 2. Today I will be doing Robbie Ventura's Force DVD (1st time). Tomorrow an easy spin.

It might be fine for you to do the hard workouts but you need to offset it with an easy workout the next day - active recovery instead of taking a day off the bike completely.

I'm wondering about your bike fit too, if maybe you might still need to tweak it a bit?

We got a new spinner in November and when I first started using it I had pain in my knee/quads that through lots of adjustments I've seemed to resolved.

Another issue might be you're pushing too hard a gear, that was true for me initially with the spinner.

You've received a lot of good advice from the others, just wanted to add my 2 cents. Good luck with your training.