Мій дядько старший за мою матір на три роки.

In Ukrainian, the present-tense form of to be is usually omitted in sentences like this.

So:

Мій дядько старший...

literally looks like:

My uncle older...

but it naturally means:

My uncle is older...

This is completely normal Ukrainian. You usually do not add є here.

A quick breakdown:

• Мій = my
• дядько = uncle
• старший = older
• за = than
• мою = my in a feminine accusative form
• матір = mother in the accusative singular
• на три роки = by three years

So the structure is basically:

[subject] + [older] + [than + person compared to] + [by how much]

Because some Ukrainian masculine nouns, especially kinship words and personal nouns, do end in -о.

So дядько is masculine even though it ends in -о. You can tell from agreement:

• мій дядько = masculine my uncle
• старший = masculine form of older

Other common masculine nouns like this include:

• батько = father
• Петро = Petro

So the ending does not automatically make a noun neuter.

Yes. In this sentence старший means older.

When talking about age, Ukrainian very often uses:

• старший = older
• молодший = younger

So:

• Мій дядько старший за мою матір = My uncle is older than my mother

This is the normal way to compare people's ages. It is better to think of старший here simply as the standard word for older when comparing people.

Also, старший is in the masculine singular form because it agrees with дядько.

Here за means than in a comparison.

After words like старший and молодший, Ukrainian often uses:

за + accusative

So:

• старший за мою матір = older than my mother

This is a very common pattern.

Because after за in this comparative pattern, the noun phrase goes into the accusative case.

So:

• моя мати = nominative, used for the subject
• мою матір = accusative, used after за

Both the possessive pronoun and the noun change form:

• моя → мою
• мати → матір

That is why the sentence does not use the dictionary form мати here.

Because мати is an irregular noun.

Its accusative singular form is матір, so after за you get:

• за мою матір

This is a more literary or formal-feeling form than everyday speech in some contexts. In conversation, many speakers would more naturally say:

• за мою маму

That means the same thing, just with the more common everyday word мама.

It tells you the amount of difference:

• старший ... на три роки = older ... by three years

This is a very common Ukrainian pattern:

comparative + на + amount

Examples:

• вищий на 10 сантиметрів = 10 centimeters taller
• молодший на два роки = younger by two years

So in your sentence, на три роки tells us by how much the uncle is older.

Because after the numerals 2, 3, 4, Ukrainian usually uses the noun form seen in:

• два роки
• три роки
• чотири роки

But after 5 and higher, you usually get the genitive plural:

• п’ять років
• шість років

So:

• на три роки = correct
• на п’ять років = correct

This is one of the most important number patterns to get used to in Ukrainian.

Yes. Ukrainian word order is more flexible than English.

Your sentence is correct as written:

Мій дядько старший за мою матір на три роки.

But a very natural alternative is:

Мій дядько на три роки старший за мою матір.

That version often sounds a bit more natural because на три роки comes right before старший.

The basic meaning stays the same. Word order mainly changes emphasis and rhythm.

Yes. In everyday speech, many people would say:

Мій дядько на три роки старший за мою маму.

Why this sounds more conversational:

• мама is more everyday than мати
• на три роки is placed before старший, which is very common in speech

So the original sentence is correct and good Ukrainian, but this version may sound more natural in casual conversation.