http://www.huffingtonpost.com/2013/07/10/student-loan-debt-median-income_n_3573683.html
Note that the median quoted is for all college graduates. Starting salary will of course be lower. So the overwhelming likelihood is that you'll graduate with debt you won't pay off for 10 years or more. Then maybe another 10 years to catch up to people who started off sooner in jobs with a lower upper limit.
In 2012, the median income for all college graduates was $46,412 while average student loan debt was $28,720, the study found.
...
In 2011, two-thirds of college students graduated with debt equivalent to about 60 percent of their annual income on average, according to a June report from Congress’ Joint Economic Committee.
Note that the median quoted is for all college graduates. Starting salary will of course be lower. So the overwhelming likelihood is that you'll graduate with debt you won't pay off for 10 years or more. Then maybe another 10 years to catch up to people who started off sooner in jobs with a lower upper limit.