Finding the age of the universe at a given redshift

[b_o3]

Hi i am confused as to how to calculate the age of the universe with redshift
say for example

The age of the universe now is 13.4 billion years old (and a critical universe).
How do i find the age of the universe if it was a redshift at say 0.6??

Do i have to find the scale factor first?
I am not very sure, please help!

 

[b_o3]

I'm trying to find the proportionality relationship between age and scale factor to get current age... can someone please help me

 

[denverdoc]

Generally questions like yours or Kingfishers get better service on the advanced physics forum,...