Hey everyone, quick question about credit cards and how it will effect my score in long run. Below you will see all my loans and credit cards that I have up to this point (everything that is on my credit report). Below you will see two credit cards: chase which is my moms and BofA which is my dads. My dads card has an annul fee of 95 and my moms doesn't have any. I am authorized user on both accounts and I am wondering if I should call the credit card companies and take myself off from being the authorized user on both cards. I use most of the cards and always pay the balance in full each month sometimes before they post my balances so non of them carry any balances, I am definitely between 1-9% each month if anything.
If I were to close them I know this will not have a big impact on my credit score since my utilization will not go up. I am wondering in 10 years when they come off my credit report, how much of an impact will it have on my credit score? Should I close them at least the one with annual monthly fee? My parents might be going back to their place of birth in Europe and I will most likely keep using the cards if I don't close them.
My report says that my oldest account was opened 7 years and 2 months ago and my average age of accounts is 4 years. Please advise me on if I should get rid of them once my parents go back to Europe or should I keep them?
Thanks for all of your help in advance 
Stan
Credit Cards:
Macy'sdsnb - account holder: individual - (Macy's store charge) - opened on 3/2009 balance is $0 - not sure about the limit as it is not shown on on credit report.
Amexdsnb - account holder: individual - (Macy's American express) - opened on 3/2009 - limit $5,000 - balance $0
Care Card - account holder: joint - opened 9/2007 - limit $5,700 - balance $0
Chase (my moms) - account holder: authorized user - opened 12/2003 - limit $6,200 - balance $0
BofA - (my dads) - account holder: authorized user - opened 7,2004 - limit $8,500 - balance 0
BofA - account holder: individual - opened 12/2003 - limit $12,000 - balance $0
BofA - account holder: individual- opened 10/2003 - limit $3,500 - balance $0
Loans
Polish/Slavic - personal student loan - account holder:Co-Signer - approved for 75,000 and 6,573 of it is used up to this point. - opened 1/2010 (this is considered as revolving account on my credit report, as the 6,573 is added to my credit card totals (revolving account totals)
AES/PNC - student loan - account holder: individual - opened 8/2008 - loan for $5,500 - balance $3,926
AES/Keystone - student loan - account holder: individual - opened 8/2004 - loan for $3,500 - balance $2,498
AES/Keystone - student loan - account holder: individual - opened 9/2003 - loan for $2,625 - balance $1,874
Natl Coleg - student loan - account holder: maker - opened 9/2006 - loan for $15,625 - balance $0 (paid off)
AES/PNC - student loan - account holder: maker - opened 9/2007 - loan for $8,633 - balance $0 (paid off)
AESConduit - student loan - account holder: individual - opened 8/2006 - loan for $5,500 - balance $0 (paid off)
AES/Keystone - student loan - account holder: individual - opened 8/2007 - loan for $5,500 - balance$ 0 (paid off)
Natl Coleg - student loan - account holder: maker - opened 8/2005 - loan for $10,526 - balance $0 (paid off)
Car Loan
Toyota Mtr - car loan - account holder: maker - opened 1/2008 - loan for $18,374 - balance $0 (paid off)
