How old do you think Uta and Renji might be?

I think Renji is listed as being in his late twenties in the first TG, which makes sense if he was Hikari’s kid brother. So by the end, early thirties?

As for Uta…

Well, probably around Renji’s age, since they shared youth together. 

Or perhaps a hundred years old; it’s Uta and we’ll never know. 😛