How Old Is Adam? Crack the Brainteaser with Our Help!

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Coreeeey
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OK...a friend of mine sent me this brain teaser and I haven't been able to crack it...I'm starting to think that maybe he made it up himself and there is no possible solution...to me its a dead end unless there's something I'm missing...I even tried googling it and found nothing...so here it is...

Marty is 24 years old. Marty is twice as old as Adam was when Marty was as old as Adam is now. How old is Adam?

If you know the answer or figure it out...post it here or pm me. :rolleyes:
 

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When Marty was 18, Adam would have been 12.

Yep. That works.
 
and how did you guys come up with that answer? Adam was 12 when Marty was as old as Adam is now. There is not enough information
 
-Job- said:
Code: 
M2

A2     M1

       A1

We have:
M2 = 24
A2 = M1
M2 - A2 = M1 - A1
M2 = 2*A1

Plenty of information.
yea as i posted that i was thinking the age differential is preserved