Young people leaving the nest to move into their first rented place might be surprised to discover that their new roommate is much older than they are—old enough to be their grandparent, in fact. That is because older renters—aged 55 and above—are the fastest-growing segment in the U.S. rental market , according to recent data, outpacing the growth of any other age group. “The roommate market has always been pretty diverse, but as living is getting more and more unaffordable, we’re seeing more