The age of onset has dropped from 29.5 years old in the 1960s to 14.5 today.

发病率也从20世 纪60年代的29.5岁下降到今天的14.5岁。

The higher number of repeats in the protein the earlier the age of onset and the more severe the symptoms.

而蛋白质中的谷氨酰胺重复次数越多，发病时间就越早、疾病症状也越严重。

The average is around 40 years old, although remember the age of onset depends on the number of CAG repeats.

发病年龄平均为40岁左右，不过要记住，发病年龄取决于CAG序列重复的数量。

The median age of onset for all anxiety disorders is a tender 11 years, with prevalence rates highest in the 20s and 30s.

所有焦虑症的平均发病年龄为 11 岁， 患病率最高的是 20 多岁和 30 多岁。

The professor recited facts in a dull, earthy voice: the average age of onset is twenty-five; there may be no symptoms before then.

该病发病的平均年龄是二十五岁，在此之前可能没有任何症状。