Hey Rich,
I think, this is what I tell myself at least, it is ok for us "mature students" to cut ourselves some slack. As Chris points out, the pro's have countless hours of practice. I have watched some of the interviews from players like Vai and Bonanassa and they talk of hours at a time working on guitar. Most of us older learners have a spent a life just earning a life with little time for much else. Guys like you and me do what we can. I am just happy to finally learn something about how the music I love is structured and can play along at some level.
Keep playing man!
This year the diet is definitely gonna stick!