Not much difference between a 7 year old bird and a 15 year old bird both have many years to live should be about the same price and neither sells for as much as a hand raised baby. The things that may determine his future success with you are more related to his history of interactions with humans , his diet and his ability to trust. If indeed he is a Rescue his history may never be known-things that have helped to shape who he is now. The numbers on bands can refer to hatch dates, who his parents are, clutch numbers and what ever else is meaningful to that breeder. It does appear to be from California but even that is not certain. I suggest feeling good about your new bird and try to let go of any negative feeling you may have about where you got him and those circumstances just move forward and think positive.