Fortran, Cobol and SAS, computer languages from the last millennium are still widely used even though they are no longer in favor with students. But old code bases can still be mission-critical. Presentations from U Miami, LANL and SAS suggest how to brush-up the legacy with AI/ML. Cobol underpins banking – but programmers are retiring. ChatGPT OK for numerical methods – so long as it doesn’t ‘hallucinate’.