Swahili normally expresses age with kuwa na “to have”: Nina miaka ishirini literally “I have twenty years.” It does not copy English “I am twenty” with the identification copula ni.
Two noun phrases matter. Miaka “years” carries the number and its concord; umri means “age” and appears in questions such as Una umri gani? “What is your age?” Unless labeled otherwise, the patterns below are current in both (informal) and (formal) Standard Swahili.
The present forms of kuwa na
The present possessive forms are solid words:
| Person | Form | Age frame |
|---|---|---|
| I | nina | nina miaka... |
| you (singular) | una | una miaka... |
| he/she | ana | ana miaka... |
| we | tuna | tuna miaka... |
| you (plural) | mna | mna miaka... |
| they | wana | wana miaka... |
Nina miaka ishirini na minne, na dada yangu ana miaka ishirini na mmoja.
I am twenty-four years old, and my sister is twenty-one.
The literal structures are “I have years twenty and four” and “she has years twenty and one.” Class 4 miaka controls the visible final-unit forms minne and mmoja.
Watoto hawa wana miaka saba na wanaanza shule mwaka huu.
These children are seven years old and are starting school this year.
Seven is invariable, so miaka saba has no mi- on the numeral. The possession verb wana agrees with the plural-human children, not with miaka.
Asking age
The direct question named in careful forms and official interviews is:
Una umri gani? — Nina umri wa miaka thelathini na miwili.
What is your age? — I am thirty-two years old.
Umri gani asks “what age?” The answer umri wa miaka... is explicit and suits (formal) forms, interviews, medical contexts, and demographic questions.
Everyday (informal) conversation very often asks by the number of years:
Una miaka mingapi? — Nina miaka kumi na tisa.
How old are you? — I am nineteen.
Mingapi agrees with class 4 miaka. It literally asks “how many years do you have?” This can be socially sensitive with an unfamiliar adult; grammar does not remove the need for appropriate context and politeness.
For a third person, change the possessor form:
Mtoto wako ana umri gani? — Ana miaka mitano na nusu.
How old is your child? — She is five and a half years old.
Class 4 miaka requires mitano. Na nusu adds “and a half.”
Year agreement from one upward
The unit noun changes between singular mwaka and plural miaka.
| Age | Standard expression | Agreement |
|---|---|---|
| one year | mwaka mmoja | class 3 singular |
| two years | miaka miwili | class 4 plural |
| three years | miaka mitatu | class 4 plural |
| four years | miaka minne | class 4 plural |
| five years | miaka mitano | class 4 plural |
| six years | miaka sita | invariable numeral |
| eight years | miaka minane | agreeing -nane |
Mwana wetu ana mwaka mmoja leo, kwa hiyo tumefanya sherehe ndogo nyumbani.
Our child is one year old today, so we have held a small celebration at home.
Do not use plural miaka with mmoja for exactly one year. With a compound number ending in one, however, the total is plural and class 4 concord remains: miaka ishirini na mmoja “twenty-one years.”
Mzee huyo ana miaka themanini na minane lakini bado hutembea sokoni kila asubuhi.
That older man is eighty-eight years old, but he still walks to the market every morning.
Eight agrees as minane after class 4 miaka. The tens portion themanini is invariable.
Babies and smaller units
For a child under one year, state months when useful: mwezi mmoja, miezi miwili, miezi mitatu. In (formal) demographic data, age may be recorded as zero completed years, but ordinary caregivers normally prefer the informative month count.
Mtoto ana miezi minane na ameanza kusimama akishikilia meza.
The baby is eight months old and has begun standing while holding the table.
Class 4 miezi takes agreeing minane. The same concord family appears with miaka.
Past age, future age, and birthdays
Outside the present, use an inflected form of kuwa plus na:
Nilipohamia Mombasa nilikuwa na miaka kumi na sita.
When I moved to Mombasa, I was sixteen years old.
The past is ni-li-ku-w-a na: nilikuwa na. English changes “am” to “was”; Swahili changes the possessive frame's copular verb.
Mwezi ujao Asha atakuwa na miaka thelathini.
Next month Asha will be thirty years old.
The future is a-ta-ku-w-a na: atakuwa na. For “turn/reach an age,” kutimiza miaka is natural:
Nitatimiza miaka ishirini na tano tarehe tisa Desemba.
I will turn twenty-five on December 9.
Kutimiza presents the birthday as completion of that number of years. It is common across (informal) and (formal) use.
People and things select different possession concord
Humans normally use class 1/2 subject concord: mtoto ana..., watoto wana.... A nonhuman noun selects its own class.
Jengo hili lina miaka sitini, lakini paa lake lina miaka mitatu tu.
This building is sixty years old, but its roof is only three years old.
Class 5 jengo and paa select li-na. The numeral phrase is still governed by class 4 miaka: miaka mitatu.
A practical age calculation
—Ulizaliwa mwaka gani? —Mwaka 2001. —Basi mwaka 2026 unatimiza miaka ishirini na mitano.
—What year were you born? —In 2001. —Then in 2026 you turn twenty-five.
The arithmetic uses bare numbers, while the result after miaka gives the agreeing final unit mitano. Exact age within the year still depends on whether the birthday has occurred.
Age information often appears on clinic or registration schedules. Keep the age number system separate from the East African clock system:
Watoto wenye umri wa miaka minne watapimwa klinikini saa mbili asubuhi.
Children aged four will be examined at the clinic at 8:00 a.m.
Class 4 miaka selects minne. The later saa mbili asubuhi is an hour label and means 8:00 a.m.; it is not read as 2:00 a.m. from midnight. See East African clock time.
Register
Una miaka mingapi? is common in (informal) conversation. Una umri gani? and una umri wa miaka mingapi? are frequent in (formal) interviews, health forms, surveys, and official contexts. Ana umri wa miaka... is more explicit than simple ana miaka... but both are Standard. Asking an adult's age may be socially delicate, especially without a practical reason.
Common Mistakes
Copying the English copula into statements or questions
❌ Mimi ni miaka ishirini.
Incorrect English-style structure—age is expressed with kuwa na.
✅ Nina miaka ishirini na ninasoma katika chuo cha ufundi.
I am twenty years old and study at a technical college.
The same correction applies in a question:
❌ Wewe ni miaka mingapi?
Incorrect—the question mixes copular identification with a possessive age phrase.
✅ Tafadhali, una umri gani?
What is your age, please?
Using plural years for exactly one
❌ Mtoto ana miaka mmoja.
Incorrect—exactly one year requires singular mwaka and class 3 mmoja.
✅ Mtoto ana mwaka mmoja na miezi miwili.
The child is one year and two months old.
Omitting numeral concord on miaka
❌ Dada yangu ana miaka tatu.
Incorrect in careful Standard agreement—class 4 miaka requires mitatu.
✅ Dada yangu ana miaka mitatu na anapenda kuchora.
My sister is three years old and likes drawing.
Making an invariable numeral agree
❌ Kaka yangu ana miaka misita.
Incorrect—sita does not take class 4 mi-.
✅ Kaka yangu ana miaka sita na anaanza darasa la kwanza.
My brother is six years old and is starting first grade.
Reading an appointment hour from midnight
❌ Miadi ya saa mbili asubuhi ni 2:00 a.m.
Incorrect—East African saa mbili asubuhi is 8:00 a.m.
✅ Miadi ya saa mbili asubuhi ni 08:00 kwa mfumo wa kimataifa.
The appointment at East African two in the morning is 08:00 internationally.
Key Takeaways
- Use kuwa na: nina miaka..., not an English-style ni miaka....
- Ask Una umri gani? or conversational Una miaka mingapi?
- The possessor controls nina/ana/lina...; mwaka/miaka controls the numeral.
- Say mwaka mmoja but miaka miwili, mitatu, minne, and mitano.
- Use nilikuwa na for past age, atakuwa na for future age, and kutimiza miaka for turning an age.
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