I don't remember when I first read the His Dark Materials Trilogy, likely in my pre-teens, but I do remember enjoying it immensely, even if I didn't understand all the subtleties at the time. Rereading it now leaves me in awe of the fantastic world building, the pacing, buildup of dramatic tension, and foreshadowing. It feels like a masterful work, and has ensnared me once again. I highly recommend.