With just a few exceptions (structural engineers, professional athletes, or astronauts come to mind), if it isn’t on your resume, go learn it!
It is never too late to add to your resume. Lifelong learning is exactly that—the duration of your life. Go learn a new skill or explore a new topic. Aside from learning being inherently fun and interesting, potential employers will be impressed with your initiative.
Here are a few ideas of places you can further your education: