They tend to have more public life, more places that draw you out of your apartment and into the social world.
Many nights you'll want to use your home as a launching pad, not just a place to hunker down.
Should local authorities work to make cities more attractive to singles? Cities should consider that young adults often move when they are single but stay in place when they get married.
By attracting more singles, those singles will eventually begin to form more young families with each other and settle down in that area, contributing to the continued vibrancy of the local economy.
Living with other people is often much cheaper per person than living on your own.