Voter Demographics

Who can vote in 2027, by generation and age band: 2019 census age structure projected to election day, joined with the IEBC 2022 register.

Scope

Population (2019)

4,396,685

Registered voters (2022)

2,415,310

Voting-age by Aug 2027 (est.)

3,438,986

Gen-z eligible 2027 (est.)

1,068,214

31.1% of the 2027 voting-age est.

Gen-z (born 1997-2012)

1,068,214 eligible

≈ 750,241 of today's registered voters, if registration mirrors the age structure.

Youth (18-34 in 2027)

1,526,841

The bloc every 2027 campaign is chasing.

Millennials (born 1981-1996)

1,580,862

Peak-turnout generation in Nairobi.

Age structure · Nairobi

2019 census population by five-year band.

0-4

524,987

5-9

432,712

10-14

378,550

15-19

351,853

20-24

563,019

25-29

583,548

30-34

495,470

35-39

345,796

40-44

253,162

45-49

174,932

50-54

113,949

55-59

76,601

60-64

43,984

65-69

26,383

70-74

16,354

75-79

7,437

80-84

4,385

85-89

2,050

90-94

873

95-99

434

100+

206

Voters by constituency and ward · Nairobi

County age share (31.1%) applied to each seat's 2022 registered voters, an estimate, since sub-county age data isn't published.

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Estimated 2027 voting-age population by ward (county age share × 2022 register). Darker = more voting-age residents.

Methodology & sources

Age structure: KNBS 2019 Census (via OCHA COD-PS, data.humdata.org/dataset/cod-ps-ken), from the 2019 census county tables (KNBS via OCHA).
Registered voters: IEBC 2022 General Election register (per ward), the same figures behind every seat page here.
2027 projections age the census cohorts forward to August 2027 (whoever was N years old in 2019 is N+8), ignoring mortality and migration; treat them as estimates.
Gen-z = born 1997-2012; those born by August 2009 are eligible in 2027. Constituency and ward figures apply the county's age share to the seat's registered voters.
These are eligibility and registration figures, never turnout predictions.