When you apply for life insurance, the age the insurer uses to price your policy isn’t always the age you’d say out loud. Carriers rely on one of three age bases, and which one they use can change your quoted age — and your premium. Here’s how each works, with plain examples.
The three age bases
Age Last Birthday (ALB)
This is your actual, completed age — the everyday number. If you had your 34th birthday three months ago, your ALB is 34. It’s the most intuitive basis and the one many insurers use.
Age Nearest Birthday (ANB)
This rounds your age to whichever birthday is closer. For the first half of the year after a birthday you’re rated at your actual age; once you pass the halfway point — roughly six months before your next birthday — you round up by one. So at 34 years and 6 months and 1 day, an Age Nearest insurer rates you as 35, even though you won’t turn 35 for nearly six months.
Age Next Birthday
The most conservative basis for the insurer: you’re always rated at the age you’ll turn on your next birthday. At 34 and one month, Age Next Birthday already rates you as 35.
Age Last Birthday = 34 · Age Nearest Birthday = 35 (past the halfway point) · Age Next Birthday = 35.
Why your insurance age can be higher than your real age
Because premiums step up with each year of age, the basis matters. Under Age Nearest, for about half of every year your insurance age is one higher than your real age. That isn’t a mistake or a trick — it’s simply the rounding convention that carrier uses, applied consistently to everyone. The insurance age calculator shows all three bases at once so you can see exactly where you fall.
When does Age Nearest change?
The switch happens at the midpoint between your last birthday and your next one — about six months after your most recent birthday. Before that date you’re rated at your actual age; on or after it you round up. Knowing this date is useful context: it explains why two people the same “age” can be quoted differently depending on where they sit in their birthday year. The calculator reports this exact date for you.
A note on how age is measured
There’s one more wrinkle: not every insurer measures your age as of today. Some use the policy issue date or the application date, which can be weeks after you first run a quote. If your birthday — or your Age Nearest switch date — falls in that window, the age used could differ from the one you calculated. This is exactly the kind of detail worth confirming with your insurer or a licensed agent.
The bottom line
Three bases, one date of birth, potentially different ages. Age Last is your real age; Age Nearest rounds to the closer birthday; Age Next always uses the upcoming age. To see all three for any date, use the insurance age calculator, and for your precise age in years, months and days, the age calculator has you covered.
This article explains general date and age conventions for information only. It is not insurance or financial advice. Premiums, underwriting and the exact age basis vary by insurer and product — always confirm with a licensed professional.