[tropo]

Oh you web people. That code has aged like a fine wine.

Consider the emacs developer. He works on legacy code dating back 41 years, to 1976.

Consider the BRL-CAD developer. He works on legacy code dating back 33 years, to 1983.

Consider the gcc developer. He works with legacy code dating back 29 years, to 1988.

Consider the SPICE developer. He works with legacy code dating back more than 44 years, to 1973 or earlier.

Consider the Windows developer. He works with legacy code dating back more than 32 years, to 1985 or earlier.

Do you happen to be younger than all of the above? These projects are all still actively used and developed. At least the first three are thought to still have full source control revision history. Any of them would look great on a resume. All of them are written in languages that were designed prior to 1980, making the youngest language 38 years old. At least one of them is largely in a language from 1958, which is 59 years ago.