I was 60 when I got wise to Starting Strength and I'd been lifting, mostly wasting my time, since high school. The discussion of the 5 lifts, the form SS advocates, and the well thought out rationale for that form was like nothing I had encountered before. Get the 3rd edition and read it thoroughly and understand it. Even then, I didn't really get it until I attended a seminar. I guess my habits had to be more forcibly broken with in-person instruction. YMMV in that regard, but I'd start with the 3rd edition.