IQ is an interesting one. I did an IQ test for my partner's sister last year; she was practicing on me for an assessment (she's about to become a registered psychologist!)
The test was definitely not what I expected. Has all sorts of different sections testing problem solving, memory, even general knowledge. She was telling me that the online ones are usually absolute bogus, because they never cover every category properly and with the right rules. Another fun fact - You can only take an IQ test once every ?? years, forget the exact number, in case you memorise methods/questions.
About 1.5 hours later, my score was in the 130's from memory. Can't remember exactly where. I'm personally not a huge fan of IQ because intelligence is such a huge thing. You can't measure intuition, or ability to communicate, both of which I would say are huge aspects of intelligence!
And yeah, age is a factor. It is 'easier' to score more highly at younger ages, basically. The same raw score would give you a lower IQ at a higher age
