-1
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17 years is a teenager and It over 16 years old. 18 years old is a young adult you can do any thing you want
18 - 17 = 1
18
It is 18 times 17 = 306.
-17 - 18 = -35
the median for 16,16,16,16,16,16,16,16,17,17,17,17,17,17,18,18,18,20,21,25 is 17