Guernsey:
18 years of age; universal
Guinea:
18 years of age; universal
Guinea-Bissau:
18 years of age; universal
Guyana:
18 years of age; universal
Haiti:
18 years of age; universal
Holy See (Vatican City):
limited to cardinals less than 80 years old
Honduras:
18 years of age; universal and compulsory
Hong Kong:
direct election 18 years of age; universal for permanent
residents living in the territory of Hong Kong for the past seven
years; indirect election limited to about 100,000 members of
functional constituencies and an 800-member election committee drawn
from broad regional groupings, municipal organizations, and central
government bodies
Hungary:
18 years of age; universal
Iceland:
18 years of age; universal