If you read Sampson and Laub's "Crime in the Making," you should follow up with this book. Laub takes the time in the first chapter to address critics of Crime in the Making, and describe in detail an update on the age-graded theory of crime. The analysis in this text is also interesting, because they include older offenders (a side interest of mine woot woot-biased my rating from 3 to 4 sorry not sorry). You can also get the same overview in Laub's published journal articles (if you don't have a University account that allows access for free, check researchgate). For a quantitative text it is fairly straight forward and easy to digest. Getting the most out of this book probably does require some statistical background in either research design or undergraduate level stats and review of social control theory on wikipedia (you developmental psych people may be very unsatisfied and wonder-um? where's the "development" in this so-called "life-course/development theory"???? hmmm-you're not wrong. But it is sociology text).
Key findings: Using the Glueck data, Laub and Sampson find that the main trajectories from Crime in the Making still hold. The major turning points of interest for this sample (which, is old and connected by important historical contexts) are still quality marriage, positive military experience, and employment. What is added in Shared Beginnings is the idea of human agency within life-course trajectories. For instance, some of the older men interviewed in this book described a strong "decision" to stop offending and get on track. For the very older men in the sample who continue to live disorganized lives, alcohol and social isolation play a key role.