Neil Patrick Harris and David Burtka are celebrating a special day.

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Harris took to social media on Tuesday to celebrate a milestone birthday for his children, Harper Burtka-Harris and Gideon Burtka-Harris.

“Double Digits! Today, Harper and Gideon turn ten years old,” NPH captioned the post. “Ten years! This last decade has absolutely whizzed by – and I’ve loved it. I’ve never felt more tired and broken down, nor more awake and alive.”

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Take a trip down memory lane and see NPH’s tweet in 2010 announcing the birth of his twins.