A growing number of young adults aged 18 to 24 balk at using credit cards. A Sallie Mae and Ipsos Public Affairs survey found that 39 percent of undergraduates ages 18 to 24 owned a credit card in 2012, compared to 49 percent in 2010. On average, adults under age 35 who do have credit cards are carrying smaller balances: a median of $1,700 in 2010 compared to $2,500 in 2001, Federal Reserve data shows. The trend is at least partly due to tougher lending rules and weaker employment prospects for young Americans since the recession. This also has consequences for the economy: fewer young adults are building helpful credit histories that can help them finance homes and cars. Credit bureaus and lenders are seeking new ways to bolster credit files and assess candidates' creditworthiness. WilliamPaid is teaming up with Experian to allow renters to pay their rents through WilliamPaid and have the on-time payment reported to Experian's RentBureau and reflected in their Experian credit reports. This can help young people build a credit history without credit cards.