Here in Brazil, priority boarding is anyone 60 years old or over (and any younger family members travelling with them). It's actually ridiculous! I have stood in the First/CW/Gold/Silver/Bronze line and watched droves of able-bodied, self-entitled, Brazilians boarding the plane just because they are 60 (and no-one actually bothers to check their age!).
In December there was a first class 60-something Brit passenger in the queue ahead of me and I kindly suggested that he would fare better and be boarded quicker if he joined the general priority queue based on his age rather than his class of travel.