Nobody buys life insurance for fun, so most people buy it late: after the baby arrives, after the mortgage closes, after a friend’s funeral makes the risk concrete. The problem with late is that life insurance is priced on the day you apply, by your age and your health on that day, and both only move in one direction. The right time to buy is the moment someone would be financially stranded by your death, and the cheapest time is a little before that.

The triggers

Life insurance has one job: replacing money that would disappear with you. If no one depends on that money, or your savings could replace it outright, you may not need a policy at all. These are the events that create the need.

  • Someone starts relying on your income. Marriage, a partner who shares the rent, a parent you support. The test is simple: if your paycheck stopped tomorrow, would someone else’s life be upended?
  • A child. This is the trigger most people recognize, and it is the largest, because the obligation runs for two decades. The stay-at-home parent needs coverage too; the surviving spouse would have to pay for the childcare and household work that parent provides, and that cost is real even though no paycheck records it.
  • A mortgage or other large co-signed debt. A surviving spouse or co-signer inherits the payments. Private student loans with a co-signer belong on this list; the co-signer remains liable.
  • A business partner. If the business could not survive the loss of one owner, a policy on each partner funds the buyout that keeps it running.
  • Leaving a job with group coverage. Employer-provided life insurance usually ends when you do, and it is rarely enough on its own. If it was your only policy, the day you give notice is a trigger.

What waiting costs

Term life premiums rise roughly 4.5% to 9% for every year of age, for the same coverage and the same health. That sounds small until you compound it. A policy bought ten years later than it could have been costs roughly 1.5 to 2.4 times as much per month, and that assumes your medical file has not changed.

Here is the anchor. A healthy nonsmoking 30-year-old buying a $500,000, 20-year term policy pays about $25 to $30 a month, based on Policygenius data from October 2025; women land at the low end of that range and men at the high end. Over the full 20 years that is roughly $6,000 to $7,200 in total premiums for half a million dollars of protection through the years a family is most exposed. Lock that in at 30 and the price never moves for two decades. Wait, and every birthday reprices it.

Health is the bigger lockout

Age raises the price predictably. Health changes it unpredictably, and sometimes closes the door. A new diagnosis, a rise in blood pressure or weight, or even a new prescription can move you into a higher rate class or lead to a decline. Insurers review your medical records and prescription history and, for larger policies, order an exam. The application you submit while healthy is the best one you will ever file, and the rate class it earns is yours for the entire term.

The conversion privilege: buy the option while you can

Most term policies carry a conversion privilege: the right to switch to a permanent policy without a new medical exam, at the rate for your age at conversion. It is the feature that makes buying early a hedge as well as a bargain. If your health deteriorates during the term, conversion lets you keep coverage for life at rates that ignore the change. The catch is the window. Conversion is allowed only for a set period, which often ends years before the term does or at a fixed age, and once a policy has rolled into annual renewal, the option is gone. Ask for the conversion deadline in writing when you buy and put it on a calendar.

How much, and for how long

The amount is the sum of what your death would cost the people who depend on you: the income they would need replaced for as long as they would need it, the debts that would land on them at once, childcare and education if children are involved, and final expenses. Someone single with no debt may only need enough to cover a funeral, or nothing. The length should run until the last of those obligations ends, which is a separate decision with its own traps; it is covered in How Long Should Your Life Insurance Policy Last? If you are choosing between term and permanent coverage, start with Term Life vs. Whole Life: Pros and Cons.

The short answer

Buy life insurance when someone would be hurt financially by your death, and buy it as soon after that moment arrives as you can manage; earlier if you can see the moment coming. Buy term for the exposed years, size it to the obligations, make sure it is convertible, and then stop thinking about it. That last part is the real payoff. A policy bought at 30 is a decision you never have to revisit at 40, when the same coverage would cost more and your medical file would have had a decade to grow.