Yes, I know a couple of Fortran 77 apps and libraries which were developed more than 25 years ago and which are still in use today.
My C++ Qt GUI application for NMR spectrum analysis (https://github.com/rochus-keller/CARA) runs since 20 years now with continuing high download and citation rates.
So obviously C++/Qt or Fortran 77 are very well suited to outlast time.