"Sorry for forgetting your birthday, Grandma!" It turns out that the iOS calendar won't display birthdays of people whose first birthday was more than 77 years ago. This is true only of birthdays in the special Birthdays calendar that's generated automatically from birthday information in Address Book. The only workaround for the moment is to create birthday events in a different calendar, though it's probably not worth much effort, since Apple will undoubtedly fix the bug in the next iOS revision by searching for "77" in the code and replacing it with a larger number. Thanks to reader Carl Pohle for alerting us to this one!