I go for the 1st of january of the year thats fastest to one past 1992. 

But do you really input your real birthday?

Usually the right year, but the first of some month other than January

april 14 1912 Titanic!

It takes too long to scroll down to my real birth year so whatever is at the bottom of the list.

If it's text boxes

1/1/1900

If it's a drop down menu with longest ago at the top I go 1/1/the top option, usually 1900

If it's a drop down menu with longest ago at the bottom I go 1/1/scroll down a fair bit and pick a random year that ensures I am >18

1-1-86

Wait,you don't have to put your real birthday???? what the hell??

My age... no reason to lie anymore.

*Cannot believe someone made a thread like this*

usually jan 1st whatever