Let's see, without having any precise data on the subject, what I can see is that in physical betting sites, such as casinos, there are older people, while young people are more likely to bet with their mobile phones (or at least talk about it). If you think about it, besides the fact that it is logical because younger people are more accustomed to new technologies, young people also tend to have less money, and online you can place smaller bets.
You're right, there's a clear difference between how older and younger gamblers like to play. The older crowd definitely prefers heading out to the physical casinos to soak in the flashy atmosphere and maybe order a few drinks while they play some slots or cards and for them, it's an experience and a bit of a social outing I guess.
But the younger gen seems totally fine just whipping out their phones and placing bets whenever its convenient, probably because they're used to doing everything on their devices nowadays. Lower bet amounts probably matter too since they have less disposable income. I dunno maybe it's a combination of factors. But clear difference in how they like to gamble based on age it seems.