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IQ is crystallized around 25.
Your thinking styles will then be pretty solid and firm. They can shift and you can learn new things, but it won't be much different. It's really about crystal intelligence after that age. I suggest maths and picking up a religion or spiritual practice that you can practice on down time to increase your IQ before then. You can practice meditation/(image streaming/auto-hypnosis)/prayer or magic if you're into that. Always come up with new ways to apply your birth genius. Once you're 25 you're really incarnated and the wheel stops turning. God I hate where I was born. YOLO so go fucking nuts if you want to be genius. You could probably read books all day and in different languages too, see storylearning.