Am I too old to play guitar?

Nope! Unless there's a Special Committee on Determining Correct Age for Beginning an Instrument that I don't know about, there is no "right time" to start playing guitar, except for... now.

Beginner to Kickass was designed to help anyone at any age to get good at guitar

Yes, the best time to start learning guitar might have been 20 years ago, but the second best time is today.