You can be both an adult and a child. One can be childlike without becoming childish. And if your inner child is comatose from disuse, midlife is a good time to revive him or her. Following are some tips. Enjoy the simple pleasures.
Childlike pleasures are simple and inexpensive.
Take time for play. With some creativity you can reconfigure them for an adult crowd. Just avoid making them too competitive and allow for plenty of imagination. Or forget your overly serious peers and find some kids to play with. They haven't forgotten how.