Why are some people taller than others?

You are quite right that is a big puzzle.

Perception or Reality? The Effect of Stature on Life Outcomes

How Do You Feel About Your Height? - The New York Times

Why are some people way taller than their family? - Quora

Is there any way to get taller as an adult?

Genomelink, Why are some people taller than others? While environment (like diet and nutrition) can play a role, one study showed that 80% of height

Agbeve Herbal Hospital

Well, apparently, tall people are more likely to be slim

Are there 100,000 (210cm, 7ft) people in the world or taller? - Quora

Why are some people short and some people tall? - Quora