If I’m 18 and My Brother Was Half My Age at 4, How Old Is He Now?

This age brain teaser is easy to get wrong if you assume the brother will always be half the other person’s age.

When I was 4 years old, my brother was half my age, so he was 2.

That means there is a 2-year age difference between us.

Age differences never change. If I am now 18 years old, my brother must still be 2 years younger:

18 − 2 = 16

The trick is remembering that the brother does not remain half the age forever.

Answer: My brother is 16 years old.

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