Hunny, I'll be 60 too in October. I recommend you buy/find at the library this book:

http://www.amazon.com/60-Up-Truth-Ab.../dp/0807029289

It kind of reads like your post :-) There's questioning and depression and "what next?" and how did this happen, etc. but in there is also some soothing and the comforting feeling that one is not alone. The author was 82 when she wrote the book; is a professional sociologist and psychotherapist, both. The author is living what she's writing about as well as being an expert in the fields and the writing is really great, you can feel her participation in what she's asking/saying.