First off, has your dad considered hiring himself out as a coach to younger CEO's, CCO's and CFO's? That would be fairly easy money and it is a market where gray hair is an asset, and not a detractor.
That said: being a bit older probably gives him a fairly unique perspective on many of the things younger devs might not even realize can be an issue, and if he were to aim for something that allows his age to work for him by strong association with the demographic that that particular software targets then it could work out well, assuming he has an aptitude for programming.
Excel-fu may well be a stronger card than any of the regular application programming languages if he wants results, it may well be that something like 'R' would be well within his comfort zone.
Best of luck, and props to your dad for even considering this!
That said: being a bit older probably gives him a fairly unique perspective on many of the things younger devs might not even realize can be an issue, and if he were to aim for something that allows his age to work for him by strong association with the demographic that that particular software targets then it could work out well, assuming he has an aptitude for programming.
Excel-fu may well be a stronger card than any of the regular application programming languages if he wants results, it may well be that something like 'R' would be well within his comfort zone.
Best of luck, and props to your dad for even considering this!