Go to http://www.britaxusa.net/support/faq.aspx, click on General Questions, then you will find How long can my child safety seat be used? It says:
Britax recommends that the use of a child restraint be discontinued if the restraint is older than six years of age or has been in a severe crash. After six years, technology has changed, components degrade from the environment (depending on how and where stored), parts get lost or installed incorrectly, or instructions and labels may not be available or not legible. The restraint may be unsafe and should be destroyed.
Go to http://www.britaxusa.net/support/faq.aspx, click on General Questions, then you will find How long can my child safety seat be used? It says:
Britax recommends that the use of a child
restraint be discontinued if the restraint is older than six years of
age or has been in a severe crash. After six years, technology has
changed, components degrade from the environment (depending on how and
where stored), parts get lost or installed incorrectly, or instructions
and labels may not be available or not legible. The restraint may be
unsafe and should be destroyed.