Board Thread:Questions and Answers/@comment-67.1.246.12-20130810173702/@comment-4913740-20130901044004

I suppose he would feel like a battle hardened veteran due to his early experiences, I just don't think it would make sense for his aging to accelerate earlier than adulthood. I don't mean that his experience would be lessened, it's more the level of intelligence. I'm not saying a 15-year-old can't be intelligent, but a conversation with a 15-year-old is very different to a conversation with a 20-25 year old. His aging definitely did kick in earlier though.

I agree that all signs seem to point to Liquid. He's the one Snake with the least fleshed out background, it would make sense to develop his backstory a bit more.