Some 5,000 people celebrated Grandparents Day at the Singapore Zoo on Sunday. Part of a slew of active-ageing activities organised by the Council for Third Age (C3A) this month, the event had participants aged between 4-months and those in their 70s. A scavenger hunt, games and live music provided ample opportunity for multi-generational fun at the event. Grandparents Day is celebrated on the fourth Sunday of November every year.