Hard to say. My score is in the same range as yours. The biggest negative in my score according to Credit Karma is the average account's lifespan (i.e., how long the accounts have been opened). Everything else is excellent.
It hasn't helped that I have opened the following accounts since last fall:
Continental CC for the 50K
AA AmExp for 75K
AA Visa for 75K
and I'm waiting on the Hyatt card.
To compound matters my oldest accounts are:
Discover card
Diners Club
I really want to cancel the Diners Club card once I figure out what to do with my 150K points since I don't use it and don't want to pay the annual fee but that will further ding the average age of my accounts.
I guess the trick is to have a couple of accounts with no annual fees and keep them opened forever. Then with the other accounts open and close them yearly.
Personally I don't see why the average age of your accounts has any bearing in your credit score. It should be income, reliability in paying your debts, any negative issues such as bankruptcies and debt to assets. I don't see any reason why me keeping cards like the two above should be a positive thing if I'm not using them.