“老古董”，本意是指古代或先人留下的旧物，也叫“古玩”（antique，curio），现在用来比喻过时的东西（something outmoded），或守旧顽固不化、思想陈旧的人（a person who is old-fashioned and likes traditional ways of doing things），与英文“old fogey”意思相近。

例句：

16岁的人觉得年过25岁的都是老古董。

When you're 16, anyone over 25 is an old fogey.

当年时髦的东西现在变成了老古董。

Things in vogue years ago now are outmoded.

祖上留下来的老古董

Antiques left by one's ancestors