Spend a lot of time outside where you can get some peace. A nice long walk by yourself would help also. I can't stand a noisy home, so I get out and away and enjoy myself. When you're home and can't avoid it, try to find a fairly quite place and read a book and block the noise out. Always worked for me when all my kids were home !
Noise cancelling headphones! Or shush them occasionally!
Depends on why they are so loud. If they play their TVs or music loud, or are arguing, ear plugs and get out as often as you can. If they are laughing and joking with one another you join in.