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Thank you for the answers. It's all amazing to think about. It seemed strange to me when reading your comment, for example, that the universe would look the same age in every direction. Why? Are we close to the center? And then it hit me (probably not for the first or last time): we can only see as far as light had time to travel here! In reality the universe just keeps going.

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Possibly. The data is consistent with an infinite universe, that expanded, and so we can only see a finite portion of it (back to the CMB). It's also consistent with a finite universe, that expanded, and so we can only see a small portion of it...

Yup, we are at the center because we are the observer. Presumably everyone anywhere would appear to be at the center, just as you appear to be the center of your world and I appear to be the center of mine.

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