Seamus' father James will mark his birthday on February 29, a date which only comes around every four years as a leap day.
While Mr Clarke is actually 44, in 2012 he will only ever have celebrated 11 birthdays on his actual birth date as one of a select batch of leap year babies.
Despite missing out on a total of 33 birthdays since 1968, the car salesman admitted being born in a leap year does have its benefits.
'I'm used to missing out on my real birthday, but being born in a leap year did have its benefits when I was at school,' he said.
'You know what children are like - especially boys. We were always giving each other birthday bumps or beats.
'But I usually got away with it because on February 28 I'd tell them "it's my birthday tomorrow" and then on March 1 I'd say "my birthday was yesterday".'
Seamus will turn 11 just hours before on February 28, something he has enjoyed reminding his father of ahead of a planned joint party.
'Seamus finds it hilarious that he will turn 11 before me,' revealed James.
'He's been telling all of his friends at school and they have a good laugh - it's a real big deal for him.'
A leap day occurs as a result of the accumulation of six additional hours every year over a period of four years as the earth orbits the sun.
Leap year babies can either celebrate their birthday on February 28 or March 1, while it is also seen as an opportunity for women to go against tradition and propose to their partners.