I wonder if Worf will have white hair like in All Good Things, especially as Picard Season 3 is already something like 7 years after AGT's timeframe.
Klingons definitely seem to go grey/white just like humans, e.g. K'mpec, Kor.
We just see fewer of them that old (at least in the warrior caste) as they either die in battle or retreat from society if they don't die in battle.