When I Was 4 Years Old, My Sister Was Half My Age. Now My Sister Is 12 Years Old. How Old Am I?

When I was 4 years old, my sister was half my age. Now my sister is 12 years old. How old am I?

 

Answer: 14 yrs old

Explanation:

When you were 4, your sister was half your age, which is 2.

Therefore, 4-2=2

There is a 2 yr gap between you and your sister.

Now that your sister is 12, and there was a 2 yr gap between you and your sister, then:

12+2=14

Therefore you were 14 when your sister was 12 :)