I think some of the above are missing the point of the original question. If you were a kid in the age of bebop who fell in love with the sound and the time of Dixieland you could still catch the old practitioners and originators who were left, but you'd feel you missed what you know, for you, was a golden age. But a kid who discovered bebop, had no time for dixieland, and was there when bebop started, would feel he was in a golden age and would talk about it for his whole life!
No matter how good we all feel the music is today, recordings can take us back in time and we become time travellers. Some find the past better than the present in terms of musical output. No amount of exhorting them to like today will make up for the fact that they'd really like to spend time in yesterday. We all do it to a certain extent, but so many of the young people I talk to regard the musical past as better than the musical present.