I think people don’t question reality until they are a certain age. They will be too busy with life — earning a living, girlfriends, kids. Then usually a major life event comes along, divorce, serious illness, loss of a job, or all of them together, that makes you start looking at existential questions and what other people have thought about it.
Where that leads them depends very much on circumstances. Some people get in touch with a shaman, others go on a massive fitness jag, or buy a Porsche. If they are lucky they might start in on Buddhism and a more spiritual path.