questions on Maugham's "Of Human Bondage"

Hello all. I'm currently writing an essay on Of Human Bondage by W. Somerset Maugham, and I was wondering if anyone familiar with the book may be able to answer two questions that I'm finding difficult to answer:

1. What is Phillip's age by the end of the book?
2. What is Sally Athelny's age when we meet her/by the end of the book?

I'm going to keep looking through the book, but if anyone happened to know this or know where I can find that information, that'd be a great help. Thanks.

I finished the reading one years ago...recently. I found some of the words are clearly in my mind. What happend ? I have to read it again and find them.
The end of the novel. Philip is about 32 or 33 and Sally is 18 or 19.
Ding