Watch Childhood's End for Free: How to Stream the Movie Online at 123Movies. . A story of two teens discovering their budding sexuality. Greg is having his first sexual experience and first relationship with his friend's mother, a woman twice his age....while Denise is angry with Greg, and sleeps with another girl. Both are in a hurry to mature, but both must deal with the repercussions of growing up, moving out, and leaving the security of childhood behind.