"Older, you know, is obviously relative. You're older if there's somebody younger than you in the room, and you're younger if there's someone older in the room."

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There are some effects of the biome. Compact bodies tend to conserve heat relative to linear ones. This can affect average height as well as body proportions. The study participants Europeans and Americans do not fall into the range where this effect is powerful, however.

— Richard H. Steckel