This is why I recommend young folks get four or five credit cards as soon at their scores pass 700.
N.B.: "Getting" is NOT the same as "charging to the max."
This has several advantages:
1) If you're just starting out, you're not going to be looking for a mortgage. Mom and Dad are probably helping out with the car payment. So if your score tanks 20 points due to the inquiries, no big deal. Within a year it will pop right back up again...plus the gainage from showing up for your financial life on time for that year, and the benefits of low utilization. The youngster's score might drop from 700 to 675 from inquiries and new accounts, but within a few months, it will be back to 700, and after a year and a half, probably 730 or so.
2) This will place the young person in an excellent position to finance an automobile. Now, rather than starting out with one credit card, and having the installment loan chop the person's average age of accounts in half, the installment loan's new age will be weighed against the existing ages of the four or five maturing credit card accounts.
3) By college graduation, the consumer will have a FICO of 760 or so, credit limits in the $5-10K range, and be in a prime position to buy a home.
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in a credit-scoring postnuclear Stone Age...