* Time Travel: Silver is from the future and has the ability to travel through time. He first appeared in Sonic the Hedgehog (2006) as a young adult, but he has traveled to the past on multiple occasions.
* No Specific Age: The Sonic series rarely provides concrete ages for its characters, especially in the early games. We know Silver is from a future where Sonic is much older, but his age at the time of his first journey is not explicitly stated.
* No Confirmed Meeting at Age 10: There's no official story where Silver meets Sonic when Sonic is specifically 10 years old.
It's possible they met at some point, but it's never been explicitly shown in the games or any official media.
It's fun to speculate, though! Maybe in a future Sonic game or story, we'll get a clearer picture of their first encounter.