\documentclass{article}
\usepackage{eso-pic}
\usepackage{fancyhdr}
\usepackage{blindtext} % just for the example
\usepackage[headsep=3cm,top=5cm]{geometry}
\AddToShipoutPicture{%
\AtTextUpperLeft{%
\makebox(420,75)[lt]{%
\footnotesize%
address@hidden@{}}%
\textbf{Author}\newline\myauthor&%
\textbf{Date of birth}\newline\mydate&%
\textbf{Address}\newline\myaddress%
\end{tabular}%
}}}
\pagestyle{fancy}
\newcommand{\myauthor}{user34083}
\newcommand{\mydate}{December 26, 1997}
\newcommand{\myaddress}{26 Washington Ave., Manhattan, New York.\newline United States of America}
\begin{document}
\blinddocument % just for the example
\end{document}