I'm a decluttering expert. Here's how to know when to replace your pillows, mattress, and sheets.

• I'm a professional declutterer and work with clients on getting rid of things they don't need. 
• The more time bedding spends in contact with your body, the sooner you need to replace it. 
• Pillowcases last three to five years, while comforters last 15 years or more. 

As a professional declutterer, I know there are some items in the house that beg to be replaced, and then there are those you don't think about all that often.

When was the last time you really looked at your sheets or comforter? You use them every day, but you may have failed to notice that your linens could be past their prime.