HISTORY AND LONGEVITY Birthday Year: Enter your birth year and watch the show! How Many Days Old Are You?: Find out how many days old you are. Longevity 1: This site calculates your expected life span based on your lifestyle and family history. Longevity 2: This site calculates your expected life span and your virtual age. This Day in History: Select any date to see births, deaths, and historical events. World Clock: Almost everything you want to know. Year by Year: Select any year from 1900 to 2017 to see how life was in that year.