And what can you tell me, if i don't live in the U.S?
Don't worry, you have an option even in that scenario. You can go to your nearest local Social Security Office, U.S embassy or consulate.
Now, lets say i'm already receiving benefits, this fact will affect my spouse's benefits too?
Not at all. Those benefits paid to you won't decrease your spouse's benefits. In fact, that could help your spouse  to decide if she wants to take her benefits earlier.