|Courtesy of NFPA|
I have a good one for you Retire your old smoke alarms if they are 10 years of age or older.
Once your alarms reach the ripe old age of 10, they are eligible for "retirement" and need to be replaced by a new generation of smoke alarms.
Even if your 10 year old, or older, smoke alarm still sounds when you push the test button, it should be replaced.
To learn how to properly dispose of a smoke alarm, please go here: How to recycle/dispose of smoke alarms
For those with battery powered alarms, please go here to learn about Maryland's Updated Smoke Alarm Law.