Stream When I Grow Up Online Free – Watch Full Movie from Home at 123Movies. . Josh is a young boy who feels neglected and misunderstood at home. Preparing to run away, he chances across an old diary once kept by his grandfather. Leafing through the yellowed pages, Josh discovers that Grandpa went through many of the same childhood travails that he is enduring at that moment. Armed with a renewed understanding of and appreciation for his elders, Josh decides to stick around for a while and see how things develop.