How can i guess the age of the speedmaster ?

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Do you have the serial number of the movement ? I think it might be written on one of the papers.
 
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I would like to sell it...

In my opinion, your asking price on Chrono24 is 2x the value of the watch.
 
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Speedmaster101.com will provide you with some excellent parameters by which to answer this question.
 
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Double check that no serial number was written in the booklets you have. Short of that you鈥檒l need somebody to open the case back and copy the serial number off the movement.

Once you have that go to Ilovemyspeedmaster.com and enter the serial number for a fairly accurate date estimate. Also for what it鈥檚 worth your listing says the watch is 34mm which is incorrect. It鈥檚 closer to 42mm.
 
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It鈥檚 either a 145.022-74 or 145.022-76(pre Sept77 build date)

Your price is high. Unless there is a step dial I am not seeing in the pictures near the hour markers.

period correct 1171/633 bracelet needs serious work and doesn鈥檛 affect price much. I鈥檇 put it around good condition using the speedmaster101.com price chart based on those pictures.

Then it鈥檚 a 145.022-69 with later production or a 145.022-71.