“老张”“老李”里的“老”不一定表示年纪很大，有时只是熟悉、亲切的叫法。
The 'lǎo' in 'Lǎo Zhāng' and 'Lǎo Lǐ' doesn't necessarily mean very old; sometimes it's just a familiar, affectionate way of addressing someone.
The 'lǎo' in 'Lǎo Zhāng' and 'Lǎo Lǐ' doesn't necessarily mean very old; sometimes it's just a familiar, affectionate way of addressing someone.