<human>: I have never had a balance, I have a small financing on my car solely for credit purposes, many years of living in cash saved up, 800+ credit score.  Never missed a payment on anything ever. 

I have 3 personal cards: Two of them are rewards cards (Opened in 2009 and 2012.  Combined cost of $85/yr - keeping these) and third I got when I was a student in 2009 (no fee).  I never use the third card as it has no rewards.  I think I shredded it probably 2 years ago so I didn't have to keep track of it.  In a normal situation, it'd probably make sense to keep it to keep my average account age high.  However, there's a kicker - it's making my average account age younger.  

When I was younger, my parents added me to a department store account, which shows up as a Capital One credit card on my credit reports - with the account open date in the early 1990's.  I'm still on it so my average account age shows up as over 8 years old... aka every card I have is making my average account age younger.  

My third card only has $4k in credit line, the other two have a combined $23k.  If I dumped it my average account age would go from 8.25 years to 9.33 years, my credit line would go from 27k to 23k.  

Also, I'm a little bit sick of having a bill come every month saying $0.  I almost wish Citi would cancel the card for inactivity

Can you condense the text into a few key points?
<bot>: Should I close a credit card account to increase my average account age from 8.25 to 9.33 years, at the expense of my credit line going from 27k to 23k?