Are there really people who don’t get a hangover?

Me [F28] and my brother [42] drank last night, I had a bottle of white wine and three quarters of Mango-Vanilla Liquor, my brother had a bottle of Gin and also the remaining liquor.

Now he runs around, has no headache and seems totally unaffected but he was drunk enough to accidentally drop a glass last night. He also drank the night before while I stayed sober there.

So, now I wonder if it is really possible that people don’t get a hangover?

And if there are men here who have the same stats [42 yo, 1,83 cm, 110 kilograms] – how drunk would you be if you’d drank the amount my brother had? I’m just curious if he’s overly immune to alcohol or if it’s common as man.