Child car seats.
Liferafts.
Safety harnesses and tethers.
The WOF on my car.
Structural Engineer's Practising Licences. (actually, on second thoughts, perhaps they are too lax...)
Medications.
Food sold to consumers ready-to-eat.
Driver licences.
Credit Cards.
Software licences.
Aircraft components.
Just a quick list of things that meet a broad definition of "stuff that seems to be too conservatively lifespan rated because I (me, maybe not you) don't understand it, but perhaps someone knows more than me".