Effective date: April 27, 2026
Reviewed by the How Old Calculator editorial team. Last reviewed April 29, 2026. This page is written for practical date-math clarity and is updated when the site expands or when common age-calculation questions change.
Use these tools for planning and reference. For legal, school, benefit, medical, travel, or employment rules, verify requirements with the official organization that controls the decision.
Informational use only
How Old Calculator provides simple informational date-math tools. Results are for convenience and general reference, not legal, medical, financial, governmental, educational, or professional advice.
No official determinations
Age-based eligibility rules vary by jurisdiction, institution, policy, and context. Verify requirements with the responsible organization.
Acceptable use
You may use the site for personal, educational, and general reference purposes. You may not misuse the site, attempt to disrupt its operation, or copy the site at scale.
How this page is maintained: We use calendar-based date math, plain-language examples, and official-source verification prompts where rules can vary by state, school, agency, or organization. This page was last reviewed on April 29, 2026.