Bhutan
total: 20.1 years
male: 19.9 years
female: 20.3 years (2002)
Bolivia
total: 20.8 years
male: 20.1 years
female: 21.5 years (2002)
Bosnia and Herzegovina
total: 35.5 years
male: 35.1 years
female: 35.9 years (2002)
Botswana
total: 19.1 years
male: 18.4 years
female: 19.8 years (2002)
Brazil
total: 27 years
male: 26.2 years
female: 27.7 years (2002)
British Virgin Islands
total: 30.7 years
male: 31 years
female: 30.4 years (2002)
Brunei
total: 26.4 years
male: 27 years
female: 25.7 years (2002)
Bulgaria
total: 40.5 years
male: 38.4 years
female: 42.4 years (2002)
Burkina Faso
total: 16.8 years
male: 16.4 years
female: 17.2 years (2002)
Burma
total: 25.3 years
male: 24.8 years
female: 25.9 years (2002)