This is a great UX test case, if you can't go into a senior center and get someone using your software, you need to try again. Color-blindness filters are good

This is a great UX test case, if you can't go into a senior center and get someone using your software, you need to try again. Color-blindness filters are good or a monochrome monitor. Some dark sunglasses and vaseline get the low vision point across too. Rubber gloves for touch issues.