When Iris was first dating Zak, wasn't he like 22? It really does appear that our theory is correct: The reason he has accomplished so much so quickly is that he is living in a different time-space continuum than Iris. I've said it before (Sunday recaps), Zak will be Iris's age in time for the wedding. He's flying through time at rocket speed, and she's crawling through time like a snail on a fence. It's been years since I pulled out the ol' Dharma Initiative tag, but I think is appropriate.