I'm in my mid 60s. Entered the design field as a graphic designer in the 1990s. Now I do UX design. Since my mid-50s, I've taught myself Sketch, Figma, css, and even a bit of php and jquery. I actually built a prototype of an app using Adobe XD to put into my portfolio while job hunting. It is possible to learn new things with the right mindset. Give it a try!