There is never too late to go back to school. I left WT when I was 22. Did not finish my BSc until I was 30~31. People were already established in their careers, while I was going to school after work. I was lucky that I knew computer programming and I had various certification, so I was able to earn a bit while finishing my B.S. in computers. This gave me a boost for better job and I was able to pursue professional certification my field and have two post-bachelor degrees. Last year I got accepted into prestigious Master's degree program and my school accepted couple credits from professional certification. I am at the process to complete my Master's degree about year from today.
Education is a whole life process. It never ends due extremely competitive job market. I am think to earn another Master's or go for PhD/doctoral degree so I can work in research. My regret is that I did not start my advanced education earlier due WT.