2015 does not matter when reported ...last activity by you is the key.

I have this on my record, long story short, helped relatives with mortgage and they screwed me over. How long does this stay on my record? 6 years?

RBC
Phone Number: High Credit/Credit Limit: 000000282000
Account Number: XXX...216 Payment Amount: $1,184.00
Association to Account: Joint Balance: $0.00
Type of Account: Mortgage Past Due: $0.00
Date Opened: 2004-07 Date of Last Activity: 2009-07
Status: Bad debt, collection account or unable to locate Date Reported: 2010-03
Months Reviewed:

Payment History: No payment 30 days late
No payment 60 days late
No payment 90 days late
Prior Paying History: Showing a repossession ( 2009-12 ) Showing a repossession ( 2009-11 ) Showing a repossession ( 2009-10 )
Comments: Account paid
Mortgage

I also noticed that date of last of activity 2009 and then Date reported is 2010. So if it is 6 years would it be 2016? or 2015 for date of last activity?