Do you know what this is called or felt like this?

Suppose someone was born in 2002 and is 23 years old. I feel that the people who were born in the early 2000s are the adults now over the kids and teens of today.

For example, one remembers 10-15 years ago when he was 8-13 years old when people who were older than him, like 18 or close to it or in their 20s, were adults in that time when he was a kid or preteen/teen coming up who was born in the mid-late 90s, so now they’re in their 30s or close to it now.

But nowadays, the babies born in the 2000s are the adults now in the new generation of young kids and teenagers of today who were the same age they were years ago, which always has me thinking at my age now and wondering where the time went. The babies who were born in the early to mid-2010s are growing up now when they weren’t even born or just being born back when I was in school back then.

What is this called exactly: a generation shift, maybe? And have others felt this way in relation to what I’m saying in my post?

Do you know what this is called or felt like this?
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