Tex is an actively used programming language created in 1978.

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Example code from the Hello World Collection:

% Hello World in plain \TeX
\immediate\write16{Hello World!}
\end

Example code from Linguist:

\ProvidesFile{verbose.bbx}
[\abx@bbxid]

\RequireBibliographyStyle{authortitle}

\endinput

Example code from Wikipedia:

The quadratic formula is $$-b \pm \sqrt{b^2 - 4ac} \over 2a$$
\bye
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Last updated February 11th, 2019