42 years. Obese.
Started doing this regimen.
Gained 10 pounds but got skinner.
I was so out of shape that I almost did not have muscle, just fat. Once I started doing my posture got better, sleep and everything.
I hate doing it but I love the results.
My go-to for science-based, reasonable exercise and diet advice is Renaissance Periodization. Nearly everyone on their team holds a PhD, does active research, and trains or competes at an elite level: https://renaissanceperiodization.com/team
Having said that: Starting Strength the book is invaluable to people who need instruction on the major compound movements and don't have access to a trainer / friend.
If the "activity" a person is training for is "general health", Starting Strength type programs are unnecessary as starting points and - in my experience and observation - are more likely to result in injury.
Also, "The Lifts" are not the only true path to building strength.
Both of them (SS & 5x5) are simple, clear and effective.