I'm looking for a table that shows the current relationship between Z number and age of the universe for the observed object. I'll take it either as based on the WMAP 13.7 Gyears age, or simply as a percentage of the presumed age.

The recent writeup about the HUDF image says z-12 = 400M years, z-7 = 800Myears.
The z-10 story a couple weeks ago said z-10 = 460Myears.

I've seen some formula for this but they are very complex. I'm just looking for a simple way to translate when only one number or the other is given. Since it looks like we're headed for some high-Z discoveries and speculation, I think this would be handy to have.

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I don't think you will find any such table, because the age of anything depends too much on the details of the cosmological model. So there is no really "agreed upon" relationship between age and redshift, because there is no really "agreed upon" cosmological model. There is a "concordance cosmology" centered around big bang, inflation, cold dark matter, and a few other things, but the concordance is hardly universal (so to speak).

However, maybe this is the next best thing: Ned Wright's Javascript Cosmology Calculator (part of his Cosmology Tutorial). This interactive calculator let's you use the "concordance cosmology", which is the default, or alter the input as you like interactively. It will return the age of the universe, according to us at redshift 0, and the age of the universe at the redshift you enter. It also returns light travel time, comoving radial distance, angular size distance, and luminosity distance. Of course, you can use it to make up your own table too.

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Thanks! This helps a lot.

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