While you cannot get the PDF, you can watch David Hamilton: A Photographic Retrospective (streaming on various art platforms). This gives you the images with narration about his technique.
You may find digital versions or archives of this book in online libraries like Open Library or art collector forums.
The primary reason "The Age of Innocence" and Hamilton's broader catalog are viewed so differently today than forty years ago is the profound evolution of societal standards, child protection laws, and ethical frameworks regarding the depiction of minors.
David found the attic by accident, or perhaps it found him. On the afternoon of his thirteenth birthday, rain pinned the town to its sidewalks and the house hummed with the low, steady tick of old pipes. David had been searching for the family board games when a loose floorboard near the back of the hall gave way beneath his foot, revealing a narrow stair that spiraled up into dust and light.
Therefore, obtaining a PDF of The Age of Innocence is not like downloading an out-of-print novel. It is a high-risk endeavor that could expose a user to legal liability and uncomfortable questions about their own intentions.
After the war, a 20-year-old Hamilton moved to Paris, the city that would become his lifelong home. He began his career not as a photographer, but as a graphic designer and art director for prestigious publications like Elle and Queen magazines. It was during this period that he honed his eye for composition, lighting, and mood—skills that would define his photographic style.
This is the most sensitive part of the discussion. David Hamilton’s work exists in a controversial space. While he maintained he was capturing "innocence and beauty," his use of adolescent models has led to widespread censorship and removal of his work from major platforms like Amazon and Instagram.