I jumped straight into Wendler's routines without reference to being a beginner in them or not. They are indeed good for us older folks. Not too many sets or reps and the deload is a welcome respite. I bought his later book 5-3-1 for powerlifting when I decided to compete last year and that worked well too. I did cut back to twice a week instead of three times a week earlier this year after becoming convinced that it was good for older folks. In fact, Wendler himself said he made his best lifts and gains as a young guy on twice a week routines.
Now of I could just recover from being sick with the flu in February and diverticulitis in April, I'd be doing great.