A seasoned tradeline is a line of credit that the borrower has held open in good standing for a long period of time, typically at least 2 years. The “seasoned” part simply implies that the account is aged or that it has an established history.
Source : https://en.wikipedia.org/wiki/Seasoned_tradeline
AUTHORIZE USER – AU’S
Authorized user accounts refer to the practice of “renting” the credit history of a high credit scoring individual to improve one’s own credit rating. An authorized user account can be a spouse added to a credit card, a child or even a close friend. We have the largest data base of AU Tradelines in the country, currently we have over 900 AU’s in our inventory and they range in price from $400 to $1800 depending on the age and the credit limit you want. *Our AU’s will post to your file in 7 to 10 days from the statement date.