Grandpa Wang has celebrated his 19th birthday in 2019, and he is 76 years old in 2019.

Because he is a grandfather, he cannot be 19 years old, so Grandpa Wang’s birthday is February 29th, a leap year that occurs once every four years, so 4*19=76, which means that Grandpa Wang has already passed 19 years The birthday conditions are as of 2019, so we push back 76 years to get 2019-76 = 1943, that is, Grandpa Wang was born on February 29, 1943, and he is 76 years old in 2019.

Extended information:

February 29 is a very special day. Human beings make up for the extra 365 days in a year every four years. on a day. February 29 does not appear in ordinary years, but only in leap years. This was done for the first time with the Julian calendar established by the ancient Romans in 46 BC. But this is still an error compared to the actual length of the solar year.

So after 1582, the calendar rules stipulated that three leap days should be canceled every four hundred years, which formed the Gregorian calendar that is used throughout the world. The current method of setting leaps in the Gregorian calendar is: there is a leap every four years, but there are no leaps in centenary years, such as 2100 and 2200. However, every year 400 requires another leap day. For example, 2000 and 2400 are both leap years.