>Most people born on February 29th celebrate their birthday on February 28th (don't they?)

That's OK, but we're trying to determine, how old they will be on March 1st the following year. If they be 1 year and 1 day old, it means that the people born on Feb. 28 should be 1 year and 2 days old. Now, it means that they were 1 year old on 28th and are now 1 year and 2 days on 1st.

This doesn't make sense, so we may assume that both categories will be 1 year and 1 day. But now where is 1 day difference? The 28th born became suddenly one day younger.

Do you see a paradox and a problem here?

<g>