Source Ben Affleck Is 'Happy and Thriving' at 51

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On Tuesday, Ben Affleck will be 51, and a source close to the actor tells PEOPLE that he is "happy and thriving" at this age.

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On his birthday, the source continues, "Everything is going great in his life. He is content and contented.

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The actor and director of Air seemed to be in a good mood lately.

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The T-shirt reads "Woke Up Sexy As Hell Again,

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" and he and his wife Jennifer Lopez left the Flying Point Surf and Skate shop in Southampton,

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New York, earlier this month, a source told PEOPLE at the time.

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The source remarked, "They were both very happy that afternoon and were very friendly to the staff.

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They grinned as they left and began to stroll down the sidewalk to finish their day.

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