I think that the young marketers out there are more succesful online in the industry as they are open to knew ideas. Us oldies often get stuck into the same routines and habits. They will also accept work for less as for the sake of gaining experience
Young people are more energetic compartively to the old people. They have new and fresh ideas. However old people have experieces but due to the age problem, it's quit difficult for the olds to work and they retire. Young people have new hope, energy, vigor to do things.
I am not sure what you are talking about. the most successful guys on the internet are not young - shoemoney, problogger, john chow, etc etc - none are "young". they are middle aged guys who just happened to be the first MMO bloggers online.