I agree with Max and moreover for many English speakers I talked to the meaning of this proverb is unclear. So if they had explained me the meaning of it I would have tried to find russian version, but they hadn't.

It's beautiful but it is not a Russian proverb.

I've never heard of it and cannot imagine how it could sound in Russian. 

When I googled it in English, sure enough it says a Russian proverb.

But googling in Russian any combination of translation of these words + proverb gives no hits, zero.

Падение листа-это шепот жизни

of all the proverbs is the most suitable

Жизнь прожить не поле перейти

Thanks everyone for your help, Is really useful to find out is not a russian proverb. In regards to the meaning, I think that the fact that the dead leave of a tree dies and falls reminds us, the living ones, that one day this will happen to us as well, but this only my interpretation. спасибо!