Even though you're growing up, you should never stop having fun.
As Nina Dobrev imply, we should never stop having fun-- even as grown adults. Without fun, we will grow old, mentally and physically. Fun activities keeps the brain active and happy.
As adults, we should not only dedicate our entire lives to work, children and chores. We should also put aside some time go out with friends and engage ourselves in activities that make us happy.
A monotonous, routine life will make us feel older than we are.