There's no such thing as 'innate' intelligence in the sense of not changing over time. Trivially, your IQ is benchmarked against a norm of people your own age,

There's no such thing as 'innate' intelligence in the sense of not changing over time. Trivially, your IQ is benchmarked against a norm of people your own age, with the absolute value of correct results changing considerably with age (typically rising steadily until ~25 before declining). There are also techniques like the dual n-back that show at least short term changes to IQ tests.