This Man Turns 15 On Monday; His Son Turns 5...The odds of this happening are 1 in 2.1 million.

02/26/2016 01:25 pm ET David MoyeReporter, The Huffington Post

Fred Shekoufeh looks a lot older than 15, but then again his son, Eric, doesn't look four either.

Fred Shekoufeh and son Eric

Shekoufeh and son, who live in La Mesa, California, share a unique bond that goes beyond genetics: They were both born on February 29.

The calendrical quirk means that even though the older Shekoufeh will celebrate 60 years on Earth on Monday, it will only be his 15th official birthday.

Eric is celebrating his 5th official birthday the same day. Both father and son were born on February 29, an event that has a 1 in 2.1 million chance of happening,according to Time.com.

Fred Shekoufeh, a native of Iran, didn't realize his birthday was unusual until 1979 when he moved to the U.S. and immigration officials commented on it. It wasn't clear at first.

"It's confusing," Shekoufeh told HuffPost. Since then, he celebrates his birthday when he can, but admits it's hard to top 1996, when he turned "10" in a hospital delivery room.

Fred Shekoufeh and son Eric

"My ex-wife was in labor and said, 'This is your birthday present,'" Shekoufeh said. "When the doctor found that out, she said, "I will try to bring that baby out so it can share your birthday."  Eric Shekoufeh said sharing such an unusual birthday with his dad is "pretty incredible," but admits being born on February 29 has some challenges.

"I get lots of jokes about whether I should celebrate on Feb. 28 or March 1," Eric said, adding that he tries to stretch it out on both days.

"It's a weird day. People don't recognize it on social media, but when they find out, they never forget it." Eric's favorite Feb. 29th birthday was in 2012, when he turned "four."     more