The BrickLink website, which now has apparently been subsumed by LEGO, requires your birth year to enter – you can't enter at all if you input a year.
I don't know you, but I refuse to give this kind of information. So bye bye BrickLink!
I contacted their customer service and told them that I'll simply avoid the BrickLink website if it requires my birth year. Their loss.
If you also disagree with this I encourage you to get in touch with them as well.
Thank you for the suggestions. I simply won't use the website; I was just curious about it.
This is small indeed, but I believe that if we don't make ourselves heard, also in the small things, then they'll just do as they please.