Why is my younger brother so much stronger than me?

I'm 18 and my brother is 16. The other day we got into a kind of (playful) wrestling match over the TV remote and I was shocked at how easily he was able to push me down and get the remote from me. Ik guys are generally stronger but he's still growing? Plus its not like he's all muscle he's literally a stick
Why is my younger brother so much stronger than me?
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