The 2007 CIA World Factbook

by United States. Central Intelligence Agency

Ireland
total: 34 years
male: 33.2 years
female: 34.8 years (2006 est.)

Isle of Man
total: 39.6 years
male: 38.4 years
female: 41 years (2006 est.)

Israel
total: 29.6 years
male: 28.8 years
female: 30.5 years (2006 est.)

Italy
total: 42.2 years
male: 40.7 years
female: 43.7 years (2006 est.)

Jamaica
total: 23 years
male: 22.4 years
female: 23.5 years (2006 est.)

Japan
total: 42.9 years
male: 41.1 years
female: 44.7 years (2006 est.)

Jersey
total: 41.4 years
male: 40.7 years
female: 42.1 years (2006 est.)

Jordan
total: 23 years
male: 23.7 years
female: 22.4 years (2006 est.)

Kazakhstan
total: 28.8 years
male: 27.2 years
female: 30.5 years (2006 est.)

Kenya
total: 18.2 years
male: 18.1 years
female: 18.3 years (2006 est.)