Stephen Harper is celebrating his 53rd birthday Monday.
His wife, Laureen Harper, came by the office and presented the prime minister with a cake, according to Harper's spokesperson.
Harper was 46 when he became Canada's 22nd leader. That puts him among some of the youngest prime ministers Canada has ever elected.
Joe Clark remains the youngest ever prime minister at age 39, he's followed by Brian Mulroney at 45. Kim Campbell was the same age as Harper when she briefly became prime minister in 1993.
The oldest person ever to become prime minister was Sir Charles Tupper, who was elected at age 74 in 1896.
In honour of Harper's big day, here's a look at how old our former PMs were when they landed the top job.
Stephen Harper - 46 years
Paul Martin - 65
Jean Chretien - 59
Kim Campbell - 46
Brian Mulroney - 45
John Turner - 55
Joe Clark - 39
Pierre Trudeau - 48
Lester B. Pearson - 65
John Diefenbaker - 61
Louis St. Laurent - 66
R. B. Bennett - 60
William Lyon Mackenzie King - 47
Arthur Meighen - 46
Sir Robert Borden - 57
Sir Wilfrid Laurier - 54
Sir Charles Tupper - 74
Sir Mackenzie Bowell - 70
Sir John Thompson - 47
Sir John Abbott - 70
Sir Alexander Mackenzie - 51
Sir John A. Macdonald - 52