Yesterday I`ve known very surprising, but also terrible for me thing: I discovered that I have been living without passport for a half year! 
I am twenty years old. I thought that people in Russia change their passports when they are twenty five, but I was wrong! Yesterday one of my friends sent me some money that she owed me on my Yandex-purse. With the new laws Yandex must ask me for my passport details before I get money from my purse there. I filled in my details and saw the message that my passport is outdated! It was very surprising! To tell more, I didn`t know before yesterday, who would go to Krasnodar for an exhibition, in which the organisation where I work is taking part in the end of February. What a luck that we have found another employee who could do this! I can`t even buy a ticket for a train as my passport isn`t valid!
I imagine what should I do now with horror! There will be so much fuss with documents!

I am twenty years old. I thought that people in Russia change their passports when they are twenty five, but I was wrong! Yesterday one of my friends sent me some money that she owed me on my Yandex-purse. With the new laws Yandex must ask me for my passport details before I get money from my purse there. I filled in my details and saw the message that my passport is outdated! It was very surprising! To tell more, I didn`t know before yesterday, who would go to Krasnodar for an exhibition, in which the organisation where I work is taking part in the end of February. What a luck that we have found another employee who could do this! I can`t even buy a ticket for a train as my passport isn`t valid!
I imagine what should I do now with horror! There will be so much fuss with documents!

(But I also changed my name, and with this I have some problems :D )
So good luck to you :3
Btw I've been in a similar position last summer. My birthday was in July, and according to the law I should have changed it in a month. So I thought that this month my old passport would be yet avaliable, but imagine my surprise when it wasn't! I was in another city and couldn't even buy a sim-card for my phone because my passport was outdated. Thanks God I've managed to buy a bus ticket to get home, but it was only because our cashiers don't look in passports at all))
By the way, the age numbers at which you should change your passport are on the last page of every Russian passport.
And I don't know why it is so, but it seems to be a common mistake about this "changing passport when you turn 25", you're not the first person I met who thought so.
Until yesterday, ... whom my organization would send, maybe?
new here and have a question)
are we discussing posts or mistakes?
both are ok, just asking
concerning the post: funny thing is I have a friend who got her passport invalid just by entering it's code somewhere online, so be careful in future
Ледяная тень, After fourty five indeed
As for the mistakes...
the unlonely god, Thank a lot!
Фоернутый меломан, What a horrible story! Great luck that cashier didn't look in passport!
Thank you, I wish I have no problems with it too!
As for the mistakes...
Himmelblau, Thanks!
Firesong, Thanks a lot for pointing on my mistakes! Yes, I agree with all of your corrections. I`m really grateful!
Aria1985, Yes, I know this now. Maybe it is because of the fact that sometimes people mix the ages of 20 and 45 and get 25
Himmelblau, I suppose, both variants are possible, aren`t they? But I can agree, your variant is better
Spider N., Hello! Nice to see you here!
We are discussing both posts and mistakes
Oh, what an awful situation! Thank you, I`ll be carefull!
After fourty five indeed
I meant not age, but a number of years, which will pass until the next change of the passport)
"to prepare mentally" - another word order
Adverb should be in front of the verb? Ok)
And how are you at all? How do you do?