Like a lot of reviwers here, I've been re-reading the Magus at odd points throughout my life, probably about once every 10 years on average. I've always admired and enjoyed it, though not entirely uncritically, and have been fascinated at my own various reactions to it over the years, reflecting my own life experiences at given times.
I think it is essentially a novel best read for the first time in curious, impressionable, early adulthood. it definately helps to have a strong imaginative streak and your head more than a little in the clouds - I've recommended it to diehard pragmatists over the years who just don't get it at all.
Like most young people who liked the book it has turned into something of a landmark in my life - the first book which I genuinely felt opened up key areas of myself and got me thinking along more abstract lines. It let me fly, basically.
The last time I read it I had just turned 40 and realised for the first time that I could no longer really identify with Nicholas as a peer-group figure, which slightly saddened me, despite the fact that I have never particularly liked him.
It also drove home to me that it really is a book aimed directly at young people, about the whole process of growing up and realising that the world, and everything in it, is a limitless but mysterious place, beyond control and all the more intoxicating for it.
I also found myself, for the first time, being a bit annoyed by Fowles's rather irritating assumption of his readers background in classical mythology, French and Shakesperian tragedy; but I try to tell myself this only reflects the cultural and educational time in which it was written.
The Magus is, quite appropriately, many things: a coming of age story; an adventure; a mystery; a romance; an historical kalidiscope; an enlightenment; an enigma; a Pandora's Box. It is, most of all, a marvellous entertainment and an affirmation of the wonder and thrill of being young with everything to look forward to and everything to discover.
The next time I read it I will probably be middle-aged and identifying more with Conchis than with the bright young things. And maybe, like the old wizard, I too will start to take pleasure in watching youth in action, and how it can dance and take flight from the strings of others.