| Country | Military service age and obligation |
| Tajikistan | 18 years of age for compulsory military service; 2-year conscript service obligation (2006) |
| Tanzania | 18 years of age for voluntary military service (2007) |
| Thailand | 21 years of age for compulsory military service; 18 years of age for voluntary military service; males are registered at 18 years of age; 2-year conscript service obligation (2006) |
| Timor-Leste | 
18 years of age for voluntary military service; no conscription (2008) |
| Togo | 18 years of age for selective compulsory and voluntary military service; 2-year service obligation (2006) |
| Tokelau | void |
| Tonga |
18 years of age (est.); no conscription (2008) |
| Trinidad and Tobago |
18 years of age for voluntary military service (16 years of age with parental consent); no conscription (2008) |
| Tunisia | 20 years of age for compulsory military service; conscript service obligation - 12 months; 18 years of age for voluntary military service (2007) |
| Turkey | 20 years of age (2004) |
| Turkmenistan | 18-30 years of age for compulsory military service; 2-year conscript service obligation (2006) |
| Turks and Caicos Islands | void |
| Tuvalu | void |
| Uganda | 18-26 years of age for compulsory and voluntary military duty; 18-30 years of age for professionals; 9-year service obligation; the government has stated that recruitment below 18 years of age could occur with proper consent and that "no person under the apparent age of 13 years shall be enrolled in the armed forces" (2007) |
| Ukraine | 18-25 years of age for compulsory and voluntary military service; conscript service obligation - 18 months for Army and Air Force, 24 months for Navy (2004) |
| United Arab Emirates |
18 years of age (est.) for voluntary military service; 18 years of age for officers and women; no conscription (2008) |
| United Kingdom |
16-33 years of age (officers 17-28) for voluntary military service (with parental consent under 18); women serve in military services, but are excluded from ground combat positions and some naval postings; must be citizen of the UK, Commonwealth, or Republic of Ireland; reservists serve a minimum of 3 years, to age 45 or 55; 16 years of age for voluntary military service by Nepalese citizens in the Brigade of the Gurkhas; 16-34 years of age for voluntary military service by Papua New Guinean citizens (2008) |
| United States | 18 years of age; 17 years of age with written parental consent (2006) |
| United States Pacific Island Wildlife Refuges | void |
| Uruguay | 18 years of age for voluntary and compulsory military service; enlistment is voluntary in peacetime, but the government has the authority to conscript in emergencies (2007) |
| Uzbekistan | 18 years of age for compulsory military service; conscript service obligation - 12 months (2004) |
| Vanuatu | void |
| Venezuela | 18 years of age for compulsory and voluntary military service; conscript service obligation - 30 months; all citizens of military service age (between 18 and 50 years old) are obligated to register for military service (2007) |
| Vietnam | 18 years of age (male) for compulsory military service; females may volunteer for active duty military service; conscript service obligation - 2 years (3 to 4 years in the navy); 18-45 years of age (male) or 18-40 years of age (female) for Militia Force or Self Defense Forces (2006) |
| Virgin Islands | void |
| Wake Island | void |
| Wallis and Futuna | void |
| West Bank | void |
| Western Sahara | void |
| World | void |
| Yemen | voluntary military service program authorized in 2001; 2-year service obligation (2006) |
| Zambia |
18 years of age for voluntary military service (16 years of age with parental consent); no conscription (2008) |
| Zimbabwe | 18-24 years of age for compulsory military service; women are eligible to serve (2007) |
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