length of credit history questions

[Migraine]

How come one bureau says I have 18 yrs length of credit (correct),another only 3 yrs and yet another says 6 yrs?
Also,is there any way to get the bureaus with the lower years to add to correct years?

Thanks!

[Anonymous]

Just a guess but I'm thinking that some weren't reporting to all three during your 18 years.

[Tuscani]

First rule of credit... CRAs have nothing to do with each other.