Ông ấy đã già.

Ông ấy literally means something like that man or that older man, but in many contexts it functions as he.

A few useful points:

• ông is a respectful word used for an older man.
• ấy helps point to a specific person already known in the conversation.
• Together, ông ấy often means he, especially when the speaker is referring respectfully to an older male.

So it is not a neutral, all-purpose he for every situation. It specifically suggests:

• male
• older than the speaker or socially senior
• some level of respect or distance

Vietnamese often does not use a verb meaning to be before adjectives.

In English, you say:

• He is old.

In Vietnamese, adjectives can directly act like the predicate:

• Ông ấy già.

So già means old, and the sentence is complete without a separate word for is.

This is very normal in Vietnamese:

• Cô ấy đẹp. = She is beautiful.
• Trời lạnh. = The weather is cold.

In this sentence, đã suggests already or a change that has been reached.

So Ông ấy đã già is not just a plain statement He is old. It often carries a nuance like:

• He is already old.
• He has become old.
• He is now old.

This is a very common point for learners: đã is often taught as a past marker, but it is not simply the same as English past tense. It can also mark that a state or event has been achieved.

Here, because già is a state, đã gives the idea that the person has reached that state.

Yes.

• Ông ấy già = He is old.
• Ông ấy đã già = He is already old / He has become old.

The version without đã is more neutral and simply describes his age or appearance.

The version with đã adds nuance:

• it may emphasize that time has passed
• it may suggest a contrast with the past
• it may feel like he's no longer young

So both are correct, but they are not exactly the same in tone.

They are similar, but not exactly identical.

• đã già often sounds a bit more formal or written.
• già rồi is very common in speech and strongly suggests already old now.

For example:

• Ông ấy đã già.
• Ông ấy già rồi.

Both can mean:

• He is already old.

But rồi often feels more conversational and can strongly mark a current resulting state.

In everyday speech, many people would naturally say:

• Ông ấy già rồi.

Ấy is a demonstrative-like word. In this kind of sentence, it helps identify the person being talked about.

With a noun or pronoun-like kinship term, it often means:

• that ...
• the one we’re talking about
• a third-person reference, similar to he/she

So:

• ông = old man / grandfather / sir / older male
• ông ấy = that older man / he

It helps distinguish the person from someone near the speaker/listener. In many contexts, it simply works as a natural third-person reference.

No. Ông has several uses.

It can mean:

• grandfather
• an older man
• Mr.
• a respectful way to refer to or address an older male

In Ông ấy đã già, it does not necessarily mean his grandfather. It usually means something more like:

• that older man
• he (respectfully, for an older male)

Vietnamese often uses family terms and social terms instead of fixed pronouns, so words like ông, bà, cô, chú, anh, chị are very important.

It can be neutral, but it can also sound blunt depending on context.

Già directly means old. It is perfectly normal Vietnamese, but when talking about a person, it may sound too direct in some situations, just like English old can sometimes sound blunt.

Depending on tone and context, speakers may prefer softer alternatives such as:

• lớn tuổi = older, elderly
• có tuổi = advanced in age
• cao tuổi = elderly, senior

So:

• Ông ấy già is grammatically fine.
• But in polite or sensitive contexts, a softer expression may be preferred.

Già has the huyền tone, a low falling tone.

Very roughly:

• già sounds like yah with a falling tone in the North
• in many Southern accents, gi sounds more like z, so it may sound closer to zah with a falling tone

A rough pronunciation guide:

• ông ≈ ohng with the ô vowel and ng at the end
• ấy has a rising tone
• đã has the ngã tone in standard spelling; pronunciation varies somewhat by region
• già has a falling tone

If you are learning pronunciation, it is best to learn both the sound and the tone together, because tone changes meaning.

The structure is:

subject + aspect/time marker + adjective

So in this sentence:

• Ông ấy = subject
• đã = aspect marker
• già = adjective/predicate

That gives:

• Ông ấy đã già.

A useful thing to remember is that Vietnamese often does not require:

• an article like the
• a verb like is
• tense marking in the same way English does

Instead, meaning is often shown through context and particles like đã, rồi, sẽ, đang, etc.

Yes, depending on who the person is and how you want to refer to him.

For example:

• Anh ấy đã già. = He is already old.
  But anh normally refers to a younger adult male or someone slightly older than the speaker, so this would be odd if the person is truly elderly.
• Bác ấy đã già. = refers respectfully to an older person, often older than one’s parents’ generation.
• Ông ta đã già. = that man is old / he is old, but ta can sound less respectful, more detached, or even negative.

So ông ấy is chosen because it fits an older male and sounds reasonably respectful.

No. This is a very important point.

Đã often relates to something completed or already reached, but it does not map perfectly onto English past tense.

For example:

• with actions, it often suggests something happened
• with states, it can suggest a state has been reached

In Ông ấy đã già, the idea is not simply he was old. It is more like:

• he is already old now
• he has grown old
• he has become old

So it is better to think of đã as an aspect marker with meanings like already, did, or has/had reached, depending on context.

Yes, the sentence is natural.

However, in everyday conversation, many speakers might also say:

• Ông ấy già rồi.
• Ông ấy lớn tuổi rồi.
• Ông ấy có tuổi rồi.

These can sound more conversational or, in some cases, softer.

So Ông ấy đã già is correct and natural, especially when you want to emphasize that he is already old or has become old, but it is not the only common way to express the idea.