The Britax Advocate ClickTight (Advocate Blvd) expires 10 years after its date of manufacture, according to Britax.
What the maker says:
discontinue use of this child seat if it is older than ten years or has been in a moderate or severe crash (see below)
Note: PDF p6. Counting basis from Britax FAQ. Model name from filename (ADV_BLVD).
Source: cdne1britaxus.azureedge.net, checked 2026-10-24.
Look up another model, or work out the date from a manufacture date