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Birthday Question

Postby Bill » Mon Feb 29, 2016 6:44 am

Jack: Yesterday was my 25th birthday!

Jill: Tomorrow will be my 25th birthday!

Both statements are true. Yet, Jill is actually older.

How is this possible?
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Re: Birthday Question

Postby BrennerM » Mon Feb 29, 2016 1:20 pm

Interesting that you would ask this on February 29th...
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Re: Birthday Question

Postby Momma Snider » Tue Mar 01, 2016 11:44 am

Is Jill really, really old?
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Re: Birthday Question

Postby Bill » Wed Mar 02, 2016 5:13 am

I see where you're going with that, and it's a perfectly legitimate interpretation of my question.

But let me confirm that Jack and Jill were both born in 1991.
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Re: Birthday Question

Postby Momma Snider » Thu Mar 03, 2016 10:50 am

I'm intrigued!
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Re: Birthday Question

Postby Bill » Thu Mar 03, 2016 12:12 pm

Jack is a Pisces who has always been intrigued by outer space. Born and raised in Seattle, Jack grew up in a Catholic family and spent a lot of time reading books about space travel and quantum physics. After earning a degree in astronomy, he moved to New York to attend graduate school. He was at a New Year's Eve party when he met graphic designer Jill. A native New Yorker raised in a Jewish family, Jill enjoys flying in her spare time, and is even working towards her pilot's license. They traded phone numbers, but weren't able to meet up until earlier this week. Over lunch, Jill asked Jack how old he was, which led to the exchange in the original post.

Does that help?
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Re: Birthday Question

Postby Momma Snider » Thu Mar 03, 2016 2:58 pm

I thought it might have something to do with where they are in relation to each other at the time of the conversation, but that doesn't explain the whole thing. I need to keep thinking.
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Re: Birthday Question

Postby Bill » Sun Mar 06, 2016 10:24 am

Answer below:

Spoiler: show
The key is that Jack and Jill were born in different time zones.

Jill was born Friday, March 1, 1991 at 1am at Mount Sinai Hospital in New York. But in Seattle, it was still Thursday.

An hour later, Jack was born at the UW Medical Center in Seattle. It was 11pm on Thursday, February 28, 1991.

Twenty-five years later, Jack and Jill had lunch. It was Monday, February 29, 2016. Jack said his birthday was yesterday (February 28). Jill said her birthday would be tomorrow (March 1). Both statements were true. Yet, Jill was actually born an hour earlier.
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Re: Birthday Question

Postby Neel Mehta » Sun Mar 06, 2016 11:13 am

Ah, well played. I couldn't put it together because I failed to realize that
Spoiler: show
while you were not using the Leap Year, you were using the Leap Day.
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Re: Birthday Question

Postby Momma Snider » Mon Mar 07, 2016 12:02 pm

Yes, that was a good one!
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Re: Birthday Question

Postby marpocky » Mon Mar 28, 2016 4:12 pm

It doesn't even require the
Spoiler: show
Leap Day. Jack is on holiday in Miami, while Jill is at a conference in San Francisco. They speak on the phone at 06:00 GMT.
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