I think this applies to most hobbies, a lack of young blood. Alice's main hobby is amateur radio and associated radio repairing etc, but she says it is rare to see anyone younger than fiftieish at a radio club or show. Then think of stamp collecting, how many people collect stamps these days, but when I was a kid, everybody did and there were stamp shops everywhere, now, youngsters are likely to ask what a stamp is. In reality the only hobby that most people have is playing video games and associated things. My great nephew is an example of this, he lives games, his only friends are similar minded youngster all over the world, playing games and he lives in a household where everyone except him, paints, sews, crafts, writes, dabbles in antiques and antiquarian books or something equally rewarding.