A number of websites ask you your birthdate as part of their registration process, including – as shown in the above example – Yahoo!
It’s interesting, government departments in many countries cannot ask for any personal information unless it is needed for the services they provide. Why can internet sites get away with this? Your date of birth is a critical piece of identity information, but it’s absolutely not necessary to register for a website.
Yahoo! in this case tries to soften the blow by promising to provide me with a “better experience”. Let me translate what that means; they will guess based on your age which ads should be served to you. So if you’re in your thirties, and perhaps visit a baby clothes site, you’ll get baby ads, if you’re over forty five it’ll be hair-loss and menopause remedies. Get older and it’s incontinence pads. As if you couldn’t search for such products without their help.
In my case I lie, I have a birthdate that I use as my “internet birthday”. Which means I’ll get the incontinence pad ads a little late.