What if Ren is Vader's kid? Could've impregnated a chick during or before Jedi, and the kid grew up with the force powers and would be in his early 30s anyway.
It's certainly a possibility, but if they're going to go with a storyline like that, I'd rather they stick with Starkiller clones and just say that they're made from Vader's DNA.
Read the freaking tags. If we don't know if Vader can even drop a deuce in that suit, that leads to an even bigger question:
How does he get his rooster out of the suit? Yeah it blows your theory out of the water.
In fairness, according to Phantom Menace, Vader wouldn't even
need to sexually impregnate someone. Though I'd love to see that, along with midichlorians, shitcanned.