Absolutely you can go back to college to continue your education. I went back. Don't worry about age on campus. There are plenty of people of all ages taking classes.
As for social aspect, I completely understand that too. I would say that most social college sororities are pretty expensive. If you got a bid to a sorority you would be expected to commit a great deal of time to them day and night. I have known one returning student, who joined a frat. While he really enjoyed, his wife was unhappy that he was away from home and their children so much and spending a great deal of money on an activity that was only for him. It's just you will be dealing with girls younger than you who don't have your life experience or responsibilities. They may not understand your circumstances. It will be foreign to them.
My advice was before committing to going through Greek Rush is to see what clubs and activities your Uni offers free. Pretty much every Uni offers a club day at the beginning of fall and summer semesters. There you can see all your many possibilities and meet the members. Even small colleges offer at lot of exciting opportunities to try new things from sea kayaking to political activism. Many of these groups have social components.
I found a wonderful, supportive group of undergrads to hang with at the ripe age of 36. They are a support group for LGBT students. I love socializing with them. I am surprised how much I have in common with them.
There can be a misconception that all the social life on a campus runs through Greek life.

(I am careful about how I socialize with undergrads. Sometimes I am the only one over 21 years old, which could have very serious legal repercussions were anything illegal to take place or results.)