lǎo / yí / bèi / rén / cháng / shuō / hòu / nǎo / sháo / zhǎng / zhe / fǎn / gǔ / de / rén / xìng / gé / pàn / nì

老一辈人常说，后脑勺长着反骨的人性格叛逆。

Older people often say that someone with a prominent bone at the back of the head has a rebellious personality.