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by nomel 1389 days ago
Elapsed time timers start at 0. Time is continuous. The elapsed time being “out of the womb”, that we call “age”, starts near 0. Five minutes after birth, the baby has been in the world for, or it’s age is, five minutes. If someone asked how old a new baby is you could hear “3 weeks”.

Another definition might be from conception. But birth being “one year old” is illogical. The sperm didn’t even exist yet, one year before birth.