Forty million decks in this country are more than 20 years old and not all of them are in great shape. That means there is a chance you or someone you care about might find be on an unsafe deck. Experts say students can be especially vulnerable partying on decks and balconies while at college. Six college students were killed in 2015 when an overcrowded balcony collapsed in California. Katie Curtis was seriously injured during a raucous homecoming party at the University of Missouri in 2017.