I went to nursing school in my early 30's, and still managed to work full time. It's very do-able. There will be many people and esp instructors that will warn you how tough school and clinicals are. They will tell you that you cannot work at all. While this may be true for some students, it isn't universal.
Nursing school is difficult and time consuming. What it really requires us determination. I hit many obstacles while in NS (husband had spinal surgery which put him out of work, lost our cars and home, I worked fulltime, then he moved 300 miles away for work without me, etc..) I maintained a b average and stayed determined to succeed. I also stayed away from the negative students.
Starting your career in nursing is a great idea. Your age really isn't much of a factor, you will see all ages in school. Understand that it will take you several years to complete. You must finish pre reqs, apply and then there is the waiting list before you can even tackle the two years of NS. If you already have a college degree, there are better routes than getting your ADN, so be sure to do your research first!