A classical liberal arts education is worth its weight in gold, but it’s not job training. It’s life training.
And you can get a lot of it on recordings from "The Teaching Company," or even free online. Not that I wouldn't love to be physically in class with J. Rufus Fears, and doing the writing assignments, but one has to be reasonable.
Starts when you are born and ends when you draw that last breath. Most 18-22 year olds don't have the perspective to absorb a true liberal arts. Also, I think a 4 year intensive reading list would likely be of more use, and practically free.
A classical education is still valuable if done right. If you major in English or foreign language for instance. But I do think you should prepare to get a teaching certificate if you study these things.
Unfortunately today most colleges do not provide a classic liberal arts education. It is mostly progressive pablum that is taught today. I was a liberal arts major — many years ago. I got a well-rounded education. I wouldn’t recommend a liberal arts degree to any high school senior today.