I doubt if I really have low testosterone? Am I in denial at 60?

Nope! Dr. Singh is absolutely correct. Low t is just a number (that varies from hour to hour, day to day). As long as you're honest w/yourself & feeling great, doing all the things you want to do & are happy w/yourself, then it's very unlikely that you have low t. It's also unlikely if you don't have an apple shape or beer belly. It's also unlikely if you don't take narcotics/opioids chronically.
Not necessarily. Most, if not all, men have lower testosterone levels at 60 compared to a younger age. However "low" testosterone by itself is not pathological. It depends if there are any signs and symptoms that may be attributable to the level of this hormone.