Hi,

If you look at http://wstein.org/sage_old/ you'll find the first few
tarballs of Sage I ever released.  The first one [1] has a README that
starts:

--------------------------------------------------------------------------
     SAGE -- Software for Algebra and Geomtry
     Copyright (C) 2004 William Stein <w...@math.harvard.edu>

     Distributed under the terms of the GNU General Public License (GPL)
     See http://www.gnu.org/licenses/
--------------------------------------------------------------------------

This is the README.txt file for the source distribution of SAGE,
version 0.1, 2005-01-23.

...

I think this was the first-ever public release of Sage.   I made it
inspired by a conversation at the 2005 JMM with David Joyner, who saw
me working on my private code there.

Based on that date, we could say that Sage will be 10 years old this
Friday.    Alternatively, it seems the first tarball I posted has the
date Feb 28, 2005.



[1] http://wstein.org/sage_old/sage-2005-02-28-2112-src-0.1.tar


-- 

William Stein
Professor of Mathematics
University of Washington
http://wstein.org

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