MOK, I've used this example before only once --- I'll bring it up again, since you seem to be sincere in trying to convince me that I'm wrong.
I'm sincere in trying to eradicate absurd beliefs from the universe. If yours is absurd then, yes, I'm trying to convince you you're wrong. If not, you can demonstrate otherwise.
Let me state beforehand that I do not think this is how God did it. This example is just to show you one way that it can be done logically.
OK, fair enough, but... why not tell me how you think God did it?
If a second dimension of time existed, one could go out at 10:00:00, enter the 2nd dimension, mow his lawn, take a shower, read the paper, then return and resume his duties.
While his watch may say 17:00:00 (5pm), a clock on the wall of his house would still read 10:00:00. Yet the lawn is mowed, he has taken a shower and read the paper.
God could have created Adam on the 6th day at 06:00:00, entered him into a 2nd dimension of time for 30 years, then returned him to 06:00:00 --- and voila --- a 30 year-old-man in the blink of an eye.
HOWEVER --- there's a problem with this. Adam, in those 30 years has acquired a memory of things he did then. He may have a few scars. Tooth decay - (okay skip that one). Longer hair. A deeper voice, etc.
So, to circumvent this, God could have created Adam on the 6th day at 06:00:00. Entered him into the 2nd dimension for 30 years, then brought him back to 06:00:00 in pristine, perfect condition, with no memory of events, no longer hair, no cuts or bruises, no nothing.
And while I do believe in a 2nd (and 3rd) dimensions of time, I emphatically do not believe God used them to embed age into His Creation.
Ah, but my objection was to the inherent logical contradiction of age being time in existence. This explanation you've given still uses time in existence, just in a different dimension: Adam is 30 years old because he's existed for 30 years (somewhere, somehow). That's fine, but seems to contradict the stance you were taking before that God could create maturity without history. Your explanation has history -- history in another dimension, yes, but history nonetheless.
Beyond that, I don't know if there's much point dealing with the details of this, since you've said you don't actually believe it. But...
I also don't see how this isn't functionally equivalent to Omphalism. Or, technically, "reverse Omphalism", I guess. Off-the-shelf, vanilla-flavored Omphalism has God create Adam last Thursday with implanted memory of the last 30 years; you've just gone the other way: God creates Adam 30 years ago and erases all memories except those since last Thursday. The difference is cosmetic, the similarity is fundamental: you still have a God doing one thing but pulling tricks to make it
appear to be something else.
And, of course, none of this gets around the theological problem of why God is deceptive, when the Bible clearly states that God is not so. So far, your only answer to that seems to be that He provided the Bible so that we're not deceived. Why? Why not just make it not deceptive in the first place? Is God not omnipotent? Is God not Truth? Suppose I made a car; the car has three pedals under the steering wheel; the one in the middle says "brake" on it; every time you push it, the cars slows down; but the owner's manual says "the middle pedal is the time-delayed ejector seat"; would you believe it? why should you? sure, it
could be true that eventually you'll be flung violently out of the car for having pushed the "brake" pedal, but all the evidence suggests that it's just a regular brake pedal. Why would you take me seriously if I did such a thing? And what possible pure motive could I have for that? If I wanted people to avoid the middle pedal, I'd put it somewhere that didn't make it look like a brake, label it "warning: ejector seat!", and (if possible*) make sure the car didn't slow down when you pushed it.
Bottom line: this theology speaks very poorly of God. But perhaps I shouldn't hold God to a "higher standard"?
*which it is, of course, because I'm omniscient and omnipotent