Housecleaning on the Mac

Love my Mac, actually I really appreciate all of my computers and programs, and phones and printers etc, etc. That is I love them when they work. Recently, I was so frustrated that my downloads were taking so long and I was blaming it on my internet provider, my server in the office etc when my son, who started using computers when he was a toddler, asked me if I ever clean up my computer. What?? I had Word documents and downloads on there from eons ago. He pointed out that I would never stand for that at the office or at home so why didn't I update and clean up my computer files? Good question. I envy the generation that has such a easy relationship with technology. My computer is now working much better.