• On the “Leap Year” episode of “Modern Family,” Cam celebrates his 10th, er, 40th birthday
• In the rom-com “Leap Year,” Amy Adams travels to Dublin to propose to her boyfriend on Feb. 29

We can calculate our age in dog years, so why not Leap Day years?

Unlike the canine formula — anyone can multiply their age by 7 to get the answer — the Leap Day math applies to people born on Feb. 29.

2023 is not a Leap Year, so there is no Feb. 29, 2023. (Just one more year, folks!) Those born on that day don’t always get to celebrate their actual birthday — since that date occurs only every four years. Someone born on Leap Day typically celebrates birthdays on Feb. 28 or March 1 and uses one of those dates for identification and important documents.

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A common year has 365 days on the calendar while a leap year boasts that extra day. Their purpose keeps our calendar in sync with the seasons and solar year, or the length of time it takes the earth to complete its orbit around the sun, which is about 365¼ days, according to timespannddspante.com.

How old are you *technically* if you were born on Leap Day? If you were born on Leap Day 1920, you would be 100 years old, or 25 in Leap Day years.

The year must be evenly divisible by 4. If the year can be evenly divided by 100, it is not a leap year unless the year is also evenly divisible by 400, according to mspanthisfun.com. For example, 2000 and 2400 are leap years, but 1800, 1900, 2100, 2200, 2300 and 2500 are not.

We’ve done the math for you in our age guide below.

Interactive graphic:Click here to view our Lespanp Dspany grspanphic

How old would you be if you were born on Leap Day?

This guide shows your spange in “humspann” yespanrs spannd Lespanp Dspany yespanrs. If you were born on Feb. 29 …

1904: You’d be 116 years old in human years or 29.

1908: You’d be 112 years old or 28. 

1912: You’d be 108 years old or 27.

1916: You’d be 104 years old or 26.

1920: You’d be 100 years old (Congrats, you’re a centenarian!) or 25.

1924: You’d be 96 years old or 24.

1928: You’d be 92 years old or 23.

1932: You’d be 88 years old or 22.

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1936: You’d be 84 years old or 21 (the legal age to drink alcoholic beverages in the U.S).

1940: You’d be 80 years old or 20.

1944: You’d be 76 years old or 19.

1948: You’d be 72 years old or 18 (the legal age to vote in the U.S. or buy lottery tickets).

1952: You’d be 68 years old or 17.

1956: You’d be 64 years old or 16 (the legal age to drive in the U.S.).

1960: You’d be 60 years old or 15 (the legal age to get a learner’s permit to drive in the U.S.).

1964: You’d be 56 years old or 14.

1968: You’d be 52 years old or 13.

1972: You’d be 48 years old or 12.

1976: You’d be 44 years old or 11.

1980: You’d be 40 years old or 10.

1984: You’d be 36 years old or 9.

1988: You’d be 32 years old or 8.

1992: You’d be 28 years old or 7.

1996: You’d be 24 years old or 6.

2000: You’d be 20 years old or 5.

2004: You’d be 16 years old (the legal age to drive in the U.S.) or 4.

2008: You’d be 12 years old or 3.

2012: You’d be 8 years old or 2.

2016: You’d be 4 years old or 1.

2020: Happy birthday! You’re a newborn, and the Leap Day math does not apply to your age until the next Leap Year in 2024, where you’ll be 4 years old and 1 in Leap Day years.

2023: Technically still a newborn until the next Leap Year in 2024 (as mentioned in the line above!).

Celebrities born on February 29

Who’s the most famous Leap Year baby? That’s subjective, but here is a list of celebrities born on Feb. 29, according to fspanmousbirthdspanys.com.

• Rapper Ja Rule
• Motivational speaker Tony Robbins
• Mark Foster, lead singer of Foster the People (“Pumped Up Kicks,” “Sit Next to Me”)
• Actor Peter Scanavino (“Law and Order: Special Victims Unit”)
• Actor Antonio Sabato Jr. (“Melrose Place,” “General Hospital”)
• Singer Dinah Shore
• Actor Dennis Farina (“Law and Order”)