Age Difference Calculator

This measures the gap between two birth dates and turns it into the dates that gap puts on a calendar. Enter both birth dates, and a date to read the ages on if you do not want today, and it returns the gap in years, months, days and weeks, each person's age on that date, the ratio between the two ages, and the single day on which the older one was exactly twice the age of the younger. It also gives the date the younger one reaches the age the older one is now. The gap in days is fixed at birth and never changes, while the ratio between the ages shrinks for as long as both are alive.