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It is unknown, because think of it like this: what if you got scared when you were a wee tyke (baby), your heartbeat speed would increase, and when you became calm it decreased. So unless you were hooked up to a heart monitor in the hospital all of your life, which is highly unlikely, and that scientists or doctors monitored how many times it beeped for your entire life, no one really knows when we reach our billionth heartbeat. You could've already had it! You heart rate changes depending on things like your age, size, health, how physically active you are and other things. So two people of the exact same age will not have had the same amount of heart beats in their life. So nobody could tell you how many heart beats you have had and when exactly you would have your billionth. Most likely it will be when you are in your 20s, but it is impossible to say exactly when.

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9y ago

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