I know pillows have a short lifespan. jonbaker even asked a hotel chambermaid once how the hotels keep their pillows so firm and comfortable. She told him they replace them every few months.
So, as a welcome home present to my husband, I bought new pillows today. Four of them. One pair with down for him and one pair with polyester for me. Nice, firm, thick pillows that means we'll be comfortable for a change.