他落伍了/跟不上时代了。
He''s behind the times.
youdao
他衣服的式样是很迷人但已非常落伍了。
His style of dress is attractive but it's really behind The Times.
你落伍了呢。现在网络上到处都是关于他的信息呢。
You are out. Now you can find many information about that in Internet.
他教书的方法已落伍了。
His methods of teaching are behind the times.
如果你不知道他，你就落伍了！
If you don't know it, you are out!
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