I'm 21 years old and have been playing every day for about 4 or 5 years. I have yet to take a formal "lesson." Whether that's a good thing or a bad thing, i don't know. But I consider my two biggest influences my teachers.
1. Edward Van Halen - the reason i picked up the guitar. His playing has so much emotion and intensity i knew i had to sound like him. VH1 still remains in heavy rotation in my car to this day.
2. Dimebag Darrel - this bastard made my fingers bleed on several occassions trying to master some of his riffs.