Princess had the oldest cruisers back in 2015/2016 by a slight margin ... I don't know for sure about today but I suspect it still leads the pact among HAL, NCL, Norwegian, Carnival or MSC.
We to sort of grew old sailing Princess not even considering HAL but maybe it's time to join the younger crown after all.
As time goes by, I'm losing more & more of the perks that used to keep us so loyal, so what's to lose?