Word: 老化 (lǎohuà) 老化 dictionary entry lǎohuà (of a person, population or material) to age; to become outdated Full dictionary entry for 老化 Example sentences using 老化 2 sentences, showing page 1 of 1. 人口老化是很多国家的问题。 Rénkǒu lǎohuà shì hěn duō guójiā de wèntí. Population aging is a problem in many countries. 皮肤老化得快，要多防晒。 Pífū lǎohuà de kuài, yào duō fángshài. Skin ages quickly, so use more sun protection.