How many credit cards should you carry?

An AskMetafilter user wonders: How many credit cards do typical people have?

For various reasons I have four credit cards. I always thought of this as too many, but haven't cancelled mine since the crappiest one is also the oldest, and has no fee, and I want to maintain the age of the card on my credit report. Most people I know have one or two cards. But reading online forums on credit, I see plenty of people with more than four. How many is normal? How many do you have?

According to How Many Credit Cards is Too Many? at MoneyCentral, "most Americans carry between five and ten credit cards". According to Steve Bucci at bankrate.com:

The average person carries eleven "credit vehicles." Typically, seven are different types of cards and four are installment loans for cars, furniture, student loans or mortgages.

I heard recently that the average number of credit accounts was 12.7 per person, which is slightly higher than Bankrate's numbers indicate. The numbers I heard are closer to the average credit statistics at myfico.com:

On average, today's consumer has a total of thirteen credit obligations on record at a credit bureau. These include credit cards (such as department store charge cards, gas cards, or bank cards) and installment loans (auto loans, mortgage loans, student loans, etc.). Not included are savings and checking accounts (typically not reported to a credit bureau). Of these thirteen credit obligations, nine are likely to be credit cards and four are likely to be installment loans.

Perhaps of more interest to some readers, Nellie Mae has statistics from the year 2000 about student credit card use. Undergrads carry about three credit cards each and graduate students carry about four credit cards each. The credit trap begins early.

Myfico.com also offers information about average debt load:

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