Do you believe IQ can change as you go from 17 to 30s?

People say your IQ does not change for the better once you become an adult but I believe I'm way more intelligent now then I was as an 18 year old kid. There is just one thing which was that my memory was better then Einstein when I was a kid and now its not super anymore.

Do you believe IQ can change as you go from 17 to 30s?
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