Final answer:
The frontal lobes, including the prefrontal cortex responsible for decision-making, fully develop by the age of 25, and this maturation contributes to more mature executive functioning.
Step-by-step explanation:
The statement that the regions of the brain responsible for decision making are among the last to develop is true. The frontal lobes, particularly the prefrontal cortex, are implicated in decision-making processes. These areas of the brain undergo significant growth during adolescence and are fully developed by the age of 25.
\The prefrontal cortex is responsible for executive functions such as judgment, impulse control, planning, abstract reasoning, evaluating risks and rewards, and problem-solving. The development of the prefrontal cortex hence contributes to maturity in these functions as individuals transition into early adulthood.