Heh, the age thing is such a confusing mess that I don't think its ever been brought up, anywhere, by anyone, since Rebirth started. I don't think it ever will. They're confirmed as older than the New 52 counterparts, but not as old as they should be.
If we're lucky, ALL of this, all of the ten years from the time Superman, Lois, and Jon arrived, to the time Rebirth started, will be erased and replaced with the post-Crisis history in its place with the change that Jon was born sometime after the wedding. The early Rebirth stories then can have still happened just without the details of there ever being a "new" Superman, and the elimination of this stupid body snatcher storyline. With stuff like that you don't even have to reference how its different, just knowing that certain details are off but that the larger story beats are still canon (i.e: Lex and Superman still fought Doomsday in Metropolis, but the encounter didn't begin with a "new" superman introducing himself to Lex). That's best case scenario, and frankly the only way I can think of to make any of this right if this Superman is THE Superman, and that's clearly what they want to establish.