Life-Course and Integrated Theories (UGC-NET Unit IV)

The starting puzzle is the age-crime curve: recorded offending rises through early adolescence, peaks in the late teens, and declines through the twenties in almost every society measured. Hirschi and Gottfredson argued this curve is invariant and that age itself does the causal work, so theory should focus on stable traits fixed early in life rather than anything that changes later.

Sampson and Laub and Moffitt both rejected that conclusion, in different ways. Sampson and Laub accepted the aggregate curve but noted it hides sharp individual divergence: two people with near-identical early records can end up on opposite trajectories by their thirties. Moffitt argued the curve is a statistical blend of two distinct groups with different causes. Both responses needed longitudinal data on the same individuals over years, which is why this branch is distinct from control or strain theory.

Keep the two labels separate for the exam. Developmental criminology, tied to Moffitt, focuses on the early origins of distinct offender types. Life-course criminology, tied to Sampson and Laub, focuses on how adult institutions and events keep shaping behaviour into adulthood. The two overlap heavily, but the syllabus bullet names life-course theory specifically.

Sampson and Laub's age-graded theory extends Hirschi's social bond theory across the life span. Hirschi's bonds, attachment, commitment, involvement and belief, still matter, but the institutions carrying them change with age: family and school dominate in youth, marriage, military service and employment take over in adulthood. Weak bonds raise offending at that stage, and a strong bond formed later can redirect even a heavily delinquent path.

The theory rests on the Glueck data, a longitudinal set of 500 delinquent and 500 matched non-delinquent Boston boys followed from the 1940s into old age, which Sampson and Laub located, recoded and extended.

Two findings anchor it. Childhood delinquency predicts adult crime only weakly once adult bonds are accounted for. And desistance was common and explainable: men who formed a strong marital bond or stable job reliably desisted, while men with similar records who lacked those bonds tended to persist.

A related idea is cumulative disadvantage: the official response to early delinquency, such as school exclusion, can itself weaken the bonds that would otherwise support later desistance.

A turning point is not just a positive life event; it is an event that restructures daily routines, supervision and attachments enough to change the costs and rewards attached to offending.

Marriage worked as a turning point in the Glueck data only where it was a good marriage, with genuine attachment and mutual investment. Military service functioned similarly for many of the Glueck men through structure and later GI Bill benefits, though Sampson and Laub flagged this as historically specific. Stable employment works through routine, a stake in conformity, and a shift away from prior co-offending peers.

Moffitt's developmental taxonomy asks a different question: why do offender types differ, not how one person changes. Life-course-persistent offenders show antisocial behaviour from as early as age three or four, arising from an interaction between neuropsychological deficits and a disrupted rearing environment.

Adolescence-limited offenders, the majority, have no early conduct-problem history; Moffitt explains their offending through the maturity gap, where adolescents reach physical maturity before gaining adult privileges, and offending becomes a way of mimicking life-course-persistent peers to claim adult status.

Because adolescence-limited offending is motivated by social mimicry rather than a stable deficit, it recedes once real adult roles arrive and typically stops by the early twenties. Moffitt's own Dunedin longitudinal study later found that some adolescence-limited offenders still carry problems like substance dependence into adulthood even after offending stops.

By the 1970s, strain theory, control theory and social learning theory each had real support and real gaps rival theories filled. Strain theory could not explain why most strained people do not offend; control theory said little about the content of delinquent motivation; social learning theory explained transmission but not initial motivation.

Elliott, with Ageton and Canter, argued in 1979 these gaps were complementary, proposing a sequence where strain and weak bonds raise delinquent peer affiliation, which becomes the proximate cause of delinquency through social learning.

Elliott's model is an integrated theory in the strict sense: it names which variable causes which, in what order. Terence Thornberry's interactional theory, set out in 1987 and tested on the Rochester Youth Development Study, went further by making the links reciprocal: delinquency itself weakens bonds and raises delinquent peer association, feeding back into more delinquency rather than a one-way chain. He also argued each cause's weight shifts across adolescence, family attachment mattering most early, peer and adult-role commitment more later.

This kind of contribution is often called theoretical elaboration rather than pure integration. Both face the same standing criticism: combining independently testable theories into one larger model can make a disconfirming result hard to trace to a single mechanism, and some critics argue integration papers over genuine disagreements between theories that treat motivation as needing explanation and theories that treat weak control as sufficient by itself.