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PARADOX OF LANGEVIN's TRAVELLER

Interpreting the time contraction of the Special Relativity Langevin imagined 
his famous Traveler who after having moved during 2 years along a straight line, 
with the constant speed v=(799/800)c would find Earthians older by 40 years.

That takes me in deep waters. In SR movement is strictly relative. Whatever 
appears to Observer1 looking from inertial referential R1 at inertial 
referential R2, will appear as well to Observer2 looking from R2 at R1. 
To somebody flying fast close to us earth will look like a flat disk. But, then, 
to us, this flying fellow will look just as flat.

So, in spite of the recognized authority of Langevin, my small head tells me 
that something must be rotten: if Earthian gets 40 years older during Traveler's 
2 years, then Traveler gets symmetrically 40 years older during Earthian 2 years. 
Each gets at the same time younger and older than the other. 
A pretty kettle of fish! 

With the General I could fairly easily pin the Traveler down, but all textbooks 
quote him as part and illustration of the Special, so with Special we must deal.

And what makes things worse, Physics actually observed Langevin's Travelers
(Not human, one has to admit what has to be admitted).

Awaiting comments.
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