37 許多研究顯示，病態性格者（psychopaths）在多少歲左右時，犯罪行為的發生比率就明顯下降？
(A) 20
(B) 30
(C) 40
(D) 50

我不曉得用APD去定義psychopath合不合適，
在我理解來說，兩者可能有類似的特質但不是相同的東西。

這題應該是出自Barlow變心的內容(他應該就是考底下那張圖)，不是DSM-5。 DSM-5引用的可能是Hare他們的研究，
來說明反社會行為(更精確來說是犯罪行為)與年齡的關聯，
但主要還是要回到原本的文獻看他說了什麼。
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原文：

As children move into adulthood, the forms of antisocial behaviors change

—from truancy and stealing from friends to extortion, assaults,

armed robbery, or other crimes. Fortunately, clinical lore,

as well as scattered empirical reports (Robins, 1966),

suggest that rates of antisocial behavior begin to decline 

rather markedly around the age of 40.

In their classic study, Hare, McPherson, and Forth (1988) provided

empirical support for this phenomenon.

They examined the conviction rates of male psychopaths and male

nonpsychopaths who had been incarcerated for a variety of crimes.

The researchers found that between the ages of 16 and 45

the conviction rates of nonpsychopaths remained relatively constant.

In contrast, the conviction rates of psychopaths remained relatively

constant up until about 40, at which time they decreased markedly

(see E Figure 12.2 下圖).

Why antisocial behavior often declines around middle age

remains unanswered (Hare et al., 2012).

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參考書籍與頁數：Barlow, D. H., Durand, V. M., & Hofmann, S. G. (2018).
Abnormal psychology: An integrative approach. 8E,
Ch12. Personality disorders, p467(developmental influences)