The first questionnaire was given to us in school and they asked about our classes, whether we planned to go to university, things like that. It was long but the school just gave it to us like it was a test (except you had to fill in little bubbles on a form which none of us had ever done before).

There were a couple after HS graduation asking about if I was in university or working, married, income, job, stuff like that. Then I had a gap (was out of the country) and after they asked things like marital status, kids, work, health life satisfaction, etc. Mostly pretty much the same, of course, because how else do you track changes over time. But it's not worth asking 16 yo about marital status -- 99.99% of the answers will be the same. And in the 80s you didn't ask about sexual orientation.

The somewhat recent blood test was the first time I'd been asked that. I presume that will continue through end of life. (Coincidentally an old classmate died last week...basically so far I've only known about a half dozen, definitely less than 10, people my age who have died. But I expect that curve to start bending upwards).

Young HN posters by the sound of it.