If I just want someone's address to send a birthday card, and maybe some kind of affirmation that it IS their birthday, how do I find this information?

This is kind of a follow-up to my question about telephone directories several weeks back.

Some “people search” sites offer this information and a lot more besides, and seem to think I am curious about criminal and financial records which I have no interest in, and dangle it like carrots.

Again, all I want is an address and to confirm a birthday which I think I know.

The recipient is not a love interest, and would be glad to hear from me, Any suggestions?