老氣橫秋

Original 霜氣橫秋, as in a famous pianwen:

風情張日，霜氣橫秋。 [Literary Chinese, trad.]

---

风情张日，霜气横秋。 [Literary Chinese, simp.]

From: 480, 孔稚珪,《北山移文》, translated by James R. Hightower

Fēngqíng zhāng rì, shuāngqì héng qiū. [Pinyin]

His flaming ardor stretched to the sun;
His frosty resolve surpassed the autumn.

Influenced by Du Fu's poem:

子雖軀幹小，老氣横九州。 [Literary Chinese, trad.]

---

子虽躯干小，老气横九州。 [Literary Chinese, simp.]

From: 757, 杜甫,《送韋十六評事充同谷郡防禦判官》

Zǐ suī qūgàn xiǎo, lǎoqì héng jiǔzhōu. [Pinyin]

Though small in stature, your sophistication overarches the Nine Provinces [i.e. across China].

The word as a blend was first attested in the Southern Song (1127–1279) dynasty.

老氣橫秋

1. proud of one's age and experience
2. downcast and decrepit