Ehhh, I've learned a few things as I got older. Mostly that "you'll understand when you're older" means "my opinions are extremely unethical and I hope you'll become selfish too"..

So now you understand!

I didn't wanna know, anyway.

What you understand when your older is that nobody knows what they are doing.

"Adult stuff" and "you'll understand when you're older" for me were mostly blank stand-ins for "this is how it is". Mostly connected to questions too tiresome to be answered properly at the time, questions on the nature of culture etc.

Thankfully, morality questions never got such answers when I was raised xD

You've finally understood that these things don't really make any sense. You've understood that some things can't really be understood.

Me with every song by The Fray after I listened to their album in fifth grade.

I feel this deeply.