What do I need in order to get my parents’ papers if I am 23 years old?

Significantly more information is needed in order to provide a legal analysis of ways your parents may be able to attain immigration benefits, but note that generally a U.S. citizen age 21 or older may successfully sponsor parents in the adjustment of status application process to become Lawful Permanent Residents (to get "Green Cards"). This is true even if your parents may have long overstayed their original visas. It would be wise for you and your parents to consult with an immigration attorney who, after learning all of the relevant information, could advise about eligibilities, options and strategies to attain your goals, and who then could offer legal representation in the often complex application process.