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SpY]

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Sam and Pam are identical twins.

In 2000, Sam departs on a 20-light year journey at the speed of light (hypothetically). When she returns (travelling a total of 40-light years) she finds Pam in 2040, being 40 years older than she is (physically, ie. wrinkles).

My first question is how much time passed for Sam? For Pam, the observer, it's 40 years. Would Pam have experienced 40 years (in her frame of reference) while traveling at the speed of light? If so, then her organs should also have aged 40 years... just as Pam.

Another way of saying this: as a person approaches the speed of light, does time slow down for them relative to the frame of reference they are traveling in, but time within their own frame remains unchanged?

If you saw that silly movie 'clockstoppers', the guy who moves at the speed of light (equivalent to Sam) appears older when he returns to proper time (so he would be older than his identical twin). Did they get Special relativity wrong?