Dante was 29 in Devil May Cry 4, and Nero was 18/19. There's a ten year age difference between them. Dante was 18/19 in Devil May Cry 3 (Which acted as his origin story, from Capcom anyway). I assume Dante would be between 17/18 in Ninja Theory's take. So Nero would be 7/8 years old in the game (If they are even going to bother staying canon to DMC, since this isn't canon anyway) But for me, it's not worth having him in it. If he was in it, he'd have to be around the same age as Dante which would mean he definitely isn't Dante/Vergil's son. But I'm happy with the thought of that. But still, it evokes more questions that need answering. I guess it depends on two things, if Ninja Theory can be that bothered to explain so much to us, or if they can do it well enough.