The big question you need to ask yourself when considering the wipers is ... Do they work? Are they cleaning the windshield without streaking? Are they removing the water as expected? If not, replace them. If the rubber of the wiper is splitting or tearing off the frame, replace them. IOW, if you're not happy with them, replace them. There is no set "this is the time".
As far as noise goes, when you clean your windshield, clean your wipers at the same time. This will help them continue to work. The easiest way I have found to do this is at the gas station, if you clean your windshield with what is provided there, turn it so the washer side (sponge) is up, placing it under the wiper and wipe it the entire length. You'll usually see a swipe of black on the squeegee sponge. Once cleaned, you'll find they will provide a much improved swipe. There are other ways to clean it as well, like cutting an apple in half and swiping it along the wiper blade to clean it. Some have even suggested a potato. It will take the "junk" off of the blade and allow it to work again.