User blog comment:Mr. Xemnas/What year does 616 take place?/@comment-3317214-20130330114108

Oh, you guys... :) Surely with 90-something comments, someone's explained how the whole thing works, so I'll just add a couple of things:

The sliding-time-scale-thingy doesn't need to be specific. We know that Secret Invasion happened one year prior to the current events. But that doesn't mean that we know that four of our years is equal to one of Earth-616's. Because that means that in 30 years, Peter Parker will nearly be 40.

That's the beauty of sliding time. We can slide it in any way to make things fit. You don't even need to assume that reality has been altered for this to happen, or assume that superpowered people age slower... Just forget specific mentionings of dates from the past, and enjoy the ride.