How do you get old student loans that have been consolidated and are older than 7 years old off your credit?

I started college in 1991. I looked on my credit report and saw that they were still reporting information to the credit bureau. I was late on payments back then but since have consolidated the loans and are now with Nelnet and I am not late with any payments. Do they count the 7 years from the date opened or from the balance date? How do I get the old inquiries off my credit?