<human>: Can you provide a brief overview of the text?

So according to creditkarma my credit score is 750 with a +/- of 50. So say my score is 700, whatever, I'm not too upset about that. But anyways, what I'm wondering is one of the various measurements of my credit score is "Average age of open lines." There are other factors such as "Total accounts, On-time payments" etc. Anyways I have 'A's in every category except for "Average age of of open lines" which I have a 'D' and in number of accounts open I have a 'C'.

So, on my credit report all of my accounts are paid in full. Do I need to actually call somebody to have the accounts removed or something? Why are paid in full accounts hurting me?
<bot>: Are my paid in full credit lines hurting me? Do I need to call someone to have them removed from my record?