I wrote up some notes and summaries of this book several years ago when I read it for anyone without the time: http://peterc.org/pedia/seneca-shortness-of-life/

I wrote up some notes and summaries of this book several years ago when I read it for anyone without the time: http://peterc.org/pedia/seneca-shortness-of-life/ http://peterc.org/pedia/seneca-shortness-of-life/ (though I do recommend reading the book, it is not very long!)