都什么年代了

dōu shén me nián dài le

What decade are you living in?

That's so out-of-date!

dōu

all; both; entirely

shén

what

me

suffix, used to form interrogative 什麼|什么[shen2 me5], what?, indefinite 這麼|这么[zhe4 me5] thus, etc

nián

grain

dài

to be a substitute for; to act on behalf of; to replace; to substitute

le

(completed action marker)