My sister, her husband, and her two sons came up to visit my family. I haven't seen them in 10 years or so. I was still a child then. I didn't really converse back then. I just did, whatever it was that we children did.
But now, a lot of time has changed. I have grown up a lot, had my own experiences, and come up with my own thoughts because of it. I was able to talk with everybody and it really meant something to me.
I enjoyed having adult conversations. We talked about serious things. Not deathly serious, mind you, but real things about life and religion and politics. We also got to shoot the breeze, tell some jokes, and crack up at hilarious impressions of people we all knew.
All of these things I simply couldn't do as a kid. They are things I kind of do/did with my friends, but it's really different remeeting somebody after 10 years and finding out who they are (and who you are, too).
Adult conversations are something you just can't have as a kid. It's one of the perks of age. It's also one of the things that makes writing a constantly new experience. As you get older, wiser, more experienced, you become a different person. That makes you a different writer. It's not something that will happen consciously, but every now and then, take a step back from yourself and see how your writing has changed. And if you notice it, don't be bothered or freaked out. Just know that it is still you.