The structure 都…了 is used to indicate that something has already happened. It is often used to express indignation or astonishment.
For example: "he's already repeated it three times but you still don't get it".
都 is placed before the predicate. If a sentence has a subject, it is placed before 都.
In this structure, either words or phrases can be placed between 都 and 了 . They can mean the following:
1) the time:
It's already eleven o'clock, don't watch TV anymore
dōu shíyī diǎn le, nǐ bié kàn diànshì le
2) an age:
Oh my God, I'm already in my 70s
tiān na, wǒ xiànzài dōu qīshí duō suì le
3) an action, which can be expressed by a verb, verb phrase or an adjective:
The food is getting cold, why isn't he coming back?
fàn dōu liánɡ le，tā zěnme hái bù huílái
He's already apologised, don't be angry
tā dōu dàoqiàn le, nǐ bié shēngqì le
He is only 4 years old, but he already knows 500 Chinese characters
tā cái sì suì, dōu rènshí wǔshí ge hànzì le
The structure 都…了can often be used with the adverb 还 or phrase 还在 ”still“.
The adverb 已经 is often used after 都.
It's already the 21st century, but you still don't know how to use a computer
dōu èrshíyī shìjì le, nǐ hái bú huì yòng diànnǎo
Medical clinics and hospitals are overcrowded, but the number of casualties and deaths are still rising
yīliáosuǒ hé yīyuàn dōu yǐjīng bèi zhùmǎn le, dànshì yùjì de shāngwáng rénshù hái zài shàngshēng
The structure can be used in a negative sentence:
We are not children anymore, it's time to live on our own