Is it safe to use old typewriting paper in my computers printer?

If it’s a similar thickness, then yes it should be fine. If it’s very thin (as some old typing paper tended to be) then it might try to feed more than one sheet at a time and cause a jam. Most printers seem to be set to take a standard thickness of paper.

Save a tree and use it.
If it has trouble feeding now just wait a month or two when the humidity gets lower.

John, you’re fine. Use it. I like any post that has “older, new” in it.

Thanks all. i now have new computer paper from WalMart. but, its good to know, in case i need a backup. john