How Old Will I Be? Future Age by Date of Birth

Sometimes you don’t want today’s age — you want to know “how old will I be” on a future date, or exactly “when did I turn 18”. A date of birth calculator handles both, because it can measure your age on any date, past or future.

Calculating your future age

To find your future age by date of birth, enter your birth date and then set the target date to the day you’re curious about — a wedding, a graduation, New Year 2030, anything. The calculator shows exactly how old you’ll be on that day in years, months and days.

When will I turn 18, 21 or 30?

Milestone birthdays are just future ages. Want to know the precise date you turn 18 (or when you already did)? Add 18 years to your date of birth and the tool confirms the exact day — useful for eligibility to vote, drive or sign contracts. The same works for 21, 30, 50 or any age.

Counting down to a milestone

Once you know the date, you can count down to it. Knowing you’ll be “exactly 40 years and 0 days” on a certain date makes planning celebrations far easier.

Past ages too

The calculator also answers “how old was I” on a past date — perfect for filling in forms or working out your age at a memorable event.

Check your age on any date

Set a future date to see how old you’ll be — or when you hit a milestone.