Unfortunately017 Archives only babies are allowed to celebrate their birthdays every month. But that doesn't mean us olds can't keep track of how many months we've been alive, too.

Take this baby and his grandpa, for example. When the tiny human sported a celebratory "9 months" T-shirt earlier this week, Grandpa also made a "684 months" version for himself.

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SEE ALSO: Family game night seems designed to make grandpa lose his teeth

Then, thanks to the baby's dad, Redditor ModXMV, they ended up on the internet.

Original image replaced with Mashable logoOriginal image has been replaced. Credit: Mashable

In case you don't want to do math (understandable), Grandpa is 57 years old. Looking good, dude!

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