My takes on all the biggest topics here

Kratos is stronger than "young Kratos". He would fuck young Kratos up, no excuses. Younger Kratos also loses to Thor.

Kratos is weaker physically than Thor, in the end he won because he focused and got that "mental powerup" from talking with Atreus earlier, and used every tool at his disposal (literally, every phase transition he uses a different weapon).

Kratos is younger than Thor, Odin, Freya and the likes, but obviously older than Magni, Modi etc