Since October 29th, 2010. Or, about 3 months and 15 days as of the writing of this answer.
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I'm afraid this question is a bit ambiguous because people do not "become" 39 years old as a fixed state. Winona Ryder turned 39 on October 29, 2010.
Ryan Hall, the American long-distance runner, was born on October 14, 1982, making him 39 years old as of 2022.
Individuals within the age range of 30 to 39 years old are commonly referred to as "thirtysomethings."
C'est ma mère et elle a 39 ans.
In 2010, someone born in 1971 would be 39 years old.
A trigenarian is a person who is in their thirties, typically between the ages of 30 and 39.