I wouldn't say "not too interested" but more like they do not have the money for it. Consider it this way, the older you get, the more money you get because of career being better salary plus whatever you family has will be passed on to you. Hence why youngest generation would not have it, they neither worked enough to earn a good salary, and usually their parents and even maybe grandparents are still alive.

But, people who are 40 or there about, may have higher salary, plus a good chunk of them may have lost their parents and inherited some stuff as well. This is why people who are 30-40 range could have a lot of interest in investment, and people who are 25 or under may be just looking to survive.