Perceptions matter when it comes to age. So how old is old? Not surprisingly the younger you are, the younger old is. A recent survey found that the Millenials - those in ther 20s - say 62 is old! Baby boomers - a generation that started turning 65 in 2011 - say old age doesn't start until 77 and the senior generation says you shouldn't be considered old until you are 81.