Bill Hinshaw is not a typical 75-year-old. He divides his time between his family – he has 32 grandchildren and great-grandchildren – and helping U.S. companies avert crippling computer meltdowns. Hinshaw, who got into programming in the 1960s when computers took up entire rooms and programmers used punch cards, is a member of a dwindling community of IT veterans who specialize in a vintage programming language called COBOL.[snip] Experienced COBOL programmers can earn more than $100 an hour when they get called in to patch up glitches, rewrite coding manuals or make new systems work with old. For their customers...