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I own some rocks that are likely billions of years old
That's cool. I want to travel to the Canadian Northern islands someday and see the rocks there, which are likely that old. Some deposits on Michigan's upper peninsula also date back to the Hadean, apparently.
Aren't most(all?) rocks billions of years old? Are we making new rocks?
We are in areas of high volcanism!
I was in Iceland a few months ago, and in some areas the rocks are only tens of years old. There are entire plains of lava flows that are only a few thousand years old. (Same for Hawaii, too.)
Rocks can grow baby rocks that grow mini rocks.