Hello, I've seen a few people in here and Discord as well been quite interested in this topic (whether we have more Pe as children or appear Pi as we age). To answer that question, around March I made a doc compiling 8 child actors with before and after videos of them. The videos usually show them between the ages of 10 to 30, which I think it's a pretty good gap to see the differences between their developments.
Here's the doc: https://docs.google.com/document/d/1vT8Hqml5nCPiCO2bRUeati4CPfFVjCFl4iSi_1GRefc/edit?usp=sharing