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Leap Year Day Babies born in 1884 had no birthday during their entire teen-age years. Why?
Because 1900 was not a Leap Year.
In 1888 they were 4 at 1. In 1892 they were 8 at 2. In 1896 they were 12 at 3. Since 1900 was not
a Leap Year, there were 8 years before they could celebrate again on February 29. So, in 1904
they were 20 at 5. Not one single teenage year was celebrated ON their birth date.

Another way to pose the question is:
Leap Year Day Babies celebrate their birthday on their birth date every four years. But those born
in 1884 couldn't celebrate on their 4th birthday when they turned 16. Why?

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