The Britax Grow With You ClickTight (CT / CT Plus) expires 9 years after its date of manufacture, according to Britax.
What the maker says:
discontinue use of this child seat when it is older than nine (9) years or has been in a moderate or severe crash.
Note: PDF p6. Counting basis from Britax FAQ.
Source: cdne1britaxus.azureedge.net, checked 2026-10-24.
Look up another model, or work out the date from a manufacture date