Hobbies! Hobby is a reflection of Human's hidden feeling. People do many different and weird things in their hobbies. Sometimes hobbies become an addiction. They are shrinking in that regard. This is just a matter of nostalgia for the people, just as they are entertaining.
Maybe pouring all the hobbies in the way of purpose was wrong. Even if a hobby is aimless but the person knows its value for him. There are some hobbies that are universal, like "reading books" and no one else can say it without purpose.
Fishing, gardening, singing and listening to music, traveling, collecting foreign currency, postage stamps, watching movies, thousands of such hobbies can be found out.
But the hobby also seems to be an age, not all hobbies at all ages. It's pretty variable.