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Should I open a credit card when I turn 18 just to start a credit score?
Not only should you do this, you should tell your friends to do it too. Especially if a parent comes in to the bank with the child, banks fall over themselves to provide a card to someone whose only income is allowance. Really. Later, if you're 21 and your car broke and you don't get paid for another 11 days, NOBODY will lend you the money (or those money mart places that charge 300% a year will) to fix it. Never mind score (and yes for sure having a good score will be a result, and a good one) just having the card for emergencies makes all the difference to your early twenties. My kids have several friends who now can't get credit cards (some are students, some are underemployed) and end up missing paid days of work due to car troubles they can't pay to fix, or using those payday lenders, or other things that keep you poor. Get one while you can. Using it sensibly means you will have a great credit score in a decade or so, but just plain having it is worth more than you can know if you're not 18 yet.