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As we know, Marty McFly from Back to the Future is the third child in the McFly family in 1985. In BTTF I we see in the picture of all three children that they progressively fade out. I understand why this is the case, but why would Marty be the last one to fade out and not the first, as he was the last one born?

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Coz he was the teenage crush of his mother.. – Evil Angel Mar 29 '14 at 8:01
up vote 19 down vote accepted

It seems that the changes in the timeline cascade forward, affecting temporally displaced facts in order of how far removed they are from the moment of distortion. Marty faded last because his birthday is the furthest away.

Were it not for his siblings fading in the same order relative to each other, it might also be possible that Marty's displacement itself offered him some kind of protection.

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Why Sir verily I must tell thee, this answer was mightily well pulled from the crack of thine own ass, I say mightily well pulled Sir! Well done that boy! It warrants the addition of a single unit from me sir, would that I could award thee many, many more! – Binary Worrier Aug 17 '15 at 7:01
@DougM are you actually Christopher Lloyd? – zer00ne Aug 17 '15 at 14:00

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