Using Ned Wright's cosmology calculator and the default
"general" parameters of 

        H0            =   69.6
        Omega M       =    0.286
        Omega Lambda  =    0.714




     Redshift                 Age at redshift (Myr)
----------------------------------------------------------
        0                        13,720

        1                         5,900

        3                         2,170

        5                         1,190

       10                           480

       12                           370
----------------------------------------------------------