I'm not 40 but close enough :P Anyway, After 3 months in Rocksmith it was obvious for me that I will need some music theory and someone to show me how to actually play. So, I subscribed to one online professional guitar lessons and now I know all the notes on 1st five frets, how are chords created, and a bit of scales (i'm into it atm). In short, there's thousands of vids covering every aspect of guitar, from theory to gear. I would advise anyone, if they are financialy able to ofcourse, to take some kind of lessons. Because, if you watched some cool vids about some guy or girl destroying the guitar while jamming... well,, you wont be able to that without some theory behind it. At least it would be a lot easier for you.