Do we know how old Kakashi is?
Using this timeline and the following data

September 15 Birth day Kakashi
Academy Grad. Age   5
Chūnin Prom. Age    6 


We can tell that Kakashi was born 14 years before the 9-tails attack. Using the information that the Akatsuki dead line was 18 years after the 9-tails attack. we can tell that Kakashi should be roughly 32 years old.