I'm 39, born n raised in a topical country but I've never been able 2 get used 2 d heat. Do some pple have better tolerance / preference 4 heat / cold?

Yes. I know of no good studies, but it's totally possible for people who grow up in warm or cold climates to not enjoy being their respective "native habitats." some people like weather extremes, others don't. No illness is generally involved.