Not every computer problem is due to old hardware.
Sometimes computers get slow because their O/S has become cluttered.
Old programs and junk downloaded can accumulate.
Websites often have junk install without your knowledge.
We only become aware if those programs are virus or malicious.

This is a good time to start over with a fresh O/S installation.
Like spring cleaning, it works well do this every year.

Or maybe you would like the newest version ?

I can save your important files, and start fresh !