I was labelled ‘gifted’ at primary, and maintained that into about year 9.
GCSE years were really tough! I think the content of them was just too much for me - although I got all A*-B, I certainly didn’t come anywhere near top of the class and some topics just didn’t come naturally to me at all. So, I don’t think ‘gifted’ kids are necessarily gifted, I think maybe they’re fast developers at picking up the basics easily - but, when it gets trickier, everyone else will catch up with them and often surpass them.
To answer the rest of your Q: I chose an ‘easy’ / soft degree, and got a First with Hons at a top uni. I have done well at work, too, but I am miles away from the ‘high-intelligence’ industries like accounting, law, banking, medicine etc, I’ve chosen a career which attracts less-bright people, and so, I do well. I feel like I’ve always been trying to maintain the appearance of success, and live up to the ‘gifted’ label, whilst knowing I am not really gifted at all, and just do a very easy job!
That said, I went to poor quality state school, with huge classes with terrible behaviour issues (not I!). I do wonder how much of adults’ ‘intelligence’ is actually just a reflection of going to amazing private schools with ten kids in their class!
Maybe irrelevant - but interesting - I met a nhs dr recently who had completed her studies in an Eastern European country. She wasn’t ‘gifted,’ didn’t do well at school, and the entry requirements in said country were not high. She passed easily and has come back to work successfully for the nhs. She can’t spell very well, has terrible grammar etc and is not at all cultured. She didn’t gain entry to any British medical courses, but is a successfully dr nonetheless.
The hare and the tortoise.