“Nearly all the alumni said they were embarrassed by their younger selves, particularly by how judgmental they used to be.”
You can learn a lot in 30 years and comparing notes with others likely reveals many of the lessons we learn are similar.
That’s evident in this post from The Atlantic featuring 30 life lessons from a Harvard 30-year reunion including that every teacher and doctor seemed happy (and most lawyers didn’t), nearly all the alumni who had kids were pleased with their decision and many of those who didn’t regretted not having done so, and many of the shyest class members went on to become the alumni class leaders and reunion organizers.