Collectors are old. Who are we going to sell to when the time comes?
I just attended a three day National Stamp Expo. I did not see one person under 20. I could count on both hands the number of people between twenty and thirty! Most people there including dealers were over fifty and I'll bet the majority of that group were 60+. At least the Boy Scouts were at the FUN Show.
No one under forty is in my coin club either! Young people are not interested in stamps or coins.