Glenn - I'm 61 as well, and I've got a Powertap on my bike. I've also got a coach, a training plan, and a set of goals. The goals came first, then the coach and the training plan, then (at her recommendation) the Powertap.

My recommendation is that you sit down with a cup of coffee and come up with a quantifiable set of goals for this year. An example of a quantifiable goal would be something like, "Complete the full El Tour de Tuscon in 6:30". Once that's done, amble on over to your local bookstore and pick up a book on training. It's true that most of them are oriented towards racing, but the basics remain true for non-racers. My recommendation would be The Time-Crunched Cyclist by by Chris Carmichael. IMO, it's the most easily understood of the training books out there, and specifically addresses the needs of non-racers as well as of racers. It's got the simplest test to determine where you are power-wise.

Once you've done that, you need to stick to your plan. Work at it steadily and consistently. You're 61, this ain't news to you.

Finally - you live in Phoenix (today's weather - 45 for a low, 79 for a high, 19% humidity) and you ride mostly inside on a Computrainer? You oughta have your head examined!