Age in Months Calculator Age in months. Age (years) Months (months) 360 Step-by-step with your numbers: 1. Values used: 2. Age = 30 years 3. Months = 360months Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! Age in months. The math behind it months = years × 12. FAQ Exact? Add leftover months from last birthday. Related calculators Age in Days Calculator Approximate age in days. Age in Weeks Calculator Approximate age in weeks.