I have two.. "Yellow" -- Coldplay (I've been in love with this song since i was in 6th grade, and I'm not in 10th.)and "Bittersweet Symphony" -- The Verve (I share this song with someone near & dear. aww.)
I really hate Good Charlotte. Also Avril Lavinge (and everyone who sings/plays with her)
And lets not forget -- any, and all rap groups/artists. Please, gag me.
Hey, I was only 14 when I started learing to play. Now I'm 15 and its been about a year since I started. You're definately not too old. You could start at the age of 80 and still not be too old. I guess determination is all that really matters when learning something new.