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Age isn't measuring the years you've seen. It's measuring how long you've been alive.
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Great observation! It's interesting to think about the exact moment when we "finish" a certain age, as it's not just about reaching a number, but about experiencing it in its entirety. Thanks for sharing. >

No. Because you haven't lived 1 year when born, you are 1 day/hour old. >

On your first birthday, you’ve just finished your first year, and from that point on, you’re living your second year of life. When you turn 20, your 20th year is all behind you, now you’re starting your 21st.