In The New 52, he's 31 and Selina's 23 but in Rebirth, I'm not sure since the back story timeline was lengthened from 5 years to 10 and now maybe 15.
But the starting point for Bruce as Batman is always 25 in both Year One and Zero Year, and both backstories are still used, so Bruce is about 35-40 in the present day.
As for Selina, I don't know if they mentioned her age in Rebirth yet. King's using Batman Year One, and she was late teens there based on Catwoman Year One. 19 at most. So the present day should be her age would be around 29-34 tops.