Welcome to the community! While not 60, I’m not exactly a spring chicken myself. 😋 With that being said, it’s pretty easy to get the basics down and have a lot of fun. If you have a design that you want to tweak a little to fit your needs. I suggest trying TinkerCAD. https://www.tinkercad.com It has some tutorials to get you started, and you can import 3D files and modify them if needed.
Let me know if this helps.