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.
That’s pretty much a textbook boycott and call to action.
It means enough to you for you to have made this post and to attempt to persuade others to take similar actions.
If you’re only now noticing the age filter, then you’re also not a regular enough site user for them to care if you stay or go.
There is no negative consequence to lying about your year of birth to gain access to the site. The only real problem for users is the routine moment of inconvenience.