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Just because you don't see them, doesn't mean they don't exist, lol. Actually many adults are going back to school. They are enrolled online, in night and weekend classes and at your local community colleges. You actually CAN still teach old dogs new tricks!

I teach an online course. A lot of my students are adults who've picked an online course, rather than a standard course, because their lives don't allow them to take a standard course, or they were hesitant to do so for the following reasons:

Time: adult students often work full time, and have families. For some of my adult students, they literally do not have any time free to attend class until after their kids are in bed, often sometime after 8pm. One of my students doesn't have time until 11pm! Since traditional college classes - even evening classes - tend to start at around 6pm (maybe 8pm), a lot of adults can't get to campus to take a class.

Travel/changing schedules: some of my adult students work swing/changing shifts. Others travel a lot for work. Still others don't have set family schedules, or need to be home for the kids while their spouse is working. They don't have childcare. You name it, but they can't get to a campus based class due to these conflicts.

Comfort: a lot of adults are afraid to set foot on a college campus. They think that most college classes are filled with 18 year olds, and they won't fit in.

Fear: a lot of adults haven't been in a school setting in decades. For someone in their 40's, they may not have been in a class in 22 years! They fear they won't be able to compete with younger students. That their study skills are rusty. That they've forgotten all the math!