How do you know his birthday is April 12? Not even Wikipedia knows that.
Check the post at 1648 for David Milo Hogg, ask the post author for the website that the data was on.
http://www.freerepublic.com/focus/f-chat/3643266/posts?q=1&;page=1641
https://flvoters.com/pages/h107561.html
https://www.browardsoe.org/Voter-Information/Voter-Lookup-Free-Access-System
Put Hogg in last name, 04/12/2000 in the birthdate field, and 7819 in the house number field and hit submit. Will bring you first page to Hogg, David Miles. The address is the same as his Dad Kevin and Mother Rebecca Boldrick so it's the correct entry. The link above is to the Broward County voter registration lookup.