The 2021 release of Tex included several bug-fixes, so not quite 12 years:
https://tug.org/texmfbug/tuneup21bugs.html
See also the following list of potential bugs, that may be included in the planned 2029 release of Tex:
https://tug.org/texmfbug/newbug.html
That said, Tex is still an impressive piece of software