AGE GUIDE
Knowing your age in months is useful for medical forms, developmental milestones, and legal purposes. Here is the exact method to do it.
To calculate your age in months:
Example: Born March 15, 1990 — today is April 10, 2026.
For quick reference, here is how many months correspond to common ages:
| Age (years) | Age (months) |
|---|---|
| 1 year | 12 months |
| 5 years | 60 months |
| 10 years | 120 months |
| 18 years | 216 months |
| 25 years | 300 months |
| 30 years | 360 months |
| 40 years | 480 months |
| 50 years | 600 months |
Doctors and pediatricians track child development in months, not years, during the first 24–36 months of life. A child who is 18 months old is at a very different developmental stage than a child who is 24 months old, even though both are technically "under 2 years old."
Courts and legal systems in some countries also use age in months for custody arrangements and benefit calculations.
If you were born in 1990, you are approximately 420–432 months old in 2026, depending on your exact birth month.
Count the number of complete months from the birth date to today. For example, a baby born on January 10 is exactly 3 months old on April 10.
Yes. Gestational age is counted from conception (roughly 2 weeks before birth). Age in months is always counted from the actual birth date.