I have a question.

A couple days ago I noticed that my right knee was little sore. Sore in the slightly hyper extended very minor strain kind of way. I hadn't ridden for 5 days prior to this so I'm pretty certain it's not biking related. I ride a fairly fast paced 10 miles last night and notice today that the tendon area just below the knee (the area that is struck during a reflex check when you get a physical) is numb (asleep).

I've never experienced this before and perhaps I'm just a "victim" of getting a bit older. I am in pretty good shape 5'10" 168 lbs 33 years old. I usually ride a couple times a week totalling about 30 miles (singletrack & occasional street). Have any of you guys experienced anything like this? Is it just a normal stress injury or something?

I doubt it is age.

I am 64 yo, and rode 169 miles last week - and have absolutely no knee problems.

Perhaps seat height? You might experiment a bit.

Go see a sports ortho specialist if it keeps up.

Show off!

Thanks for the input. I did stop to adjust my seat...

...just may be on to something.