Actually, I think that's a great example--on the one hand, I would probably find that annoying and unpleasant. On the other hand, had I done more sports earlier in my life, I would be better off now. (I am currently not nearly as fit as I should be.)

That said, I don't think raising the required education age is the right move either. In a perfect world, we would concentrate on improving the quality of education instead, both imparting more knowledge in the time people are at school and getting them to like school more. However, I do not have the slightest clue of how to accomplish this.