How often should you replace smoke detectors?
I noticed several of mine have a manufactured date of 2003, so I'm guessing those need to be replaced ASAP. The rest are dated 2008-2010 so I'm imaging those need to be replaced soon as well. There doesn't seem to be anything wrong with them when tested either by pressing the button or with smoke from a match.
I'm hoping to replace them all this year along with my CO detector. So it's a bit of a moot point really.