The elephant in the room here is that perhaps the biggest difference between the two learning experiences that OP is describing is himself.
He might just have discovered he is more mature at 30 than he was at 18...
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He might just have discovered he is more mature at 30 than he was at 18...
How? Surely over 15 weeks each course taught you something about either the world or yourself.
I just looked back over my undergrad transcript to double check my experience. I took something away from every single class. It wasn't always the material itself.