Dear Liz: The wife and I are both 65. We both work, with a combined income of $125,000, of which we spend almost all. We have $550,000 in IRAs and $1 million in other investments, plus home equity of about $500,000. We’ll get $3,800 from Social Security if we start next year but plan to work until age 67. Should we wait until then to claim?

Answer: Both of you needn’t wait, but one of you should — the one who has the larger benefit.

As a married couple, you can get two checks — either two retirement benefits, or a retirement benefit and a spousal benefit that can equal up to half the primary retirement benefit. When one of you dies, the survivor will receive only one benefit, which will be the larger of the two checks you received as a couple.

It makes sense to maximize that benefit by waiting as long as possible to claim so that it can grow. After your full retirement age, which is currently 66, unclaimed retirement benefits grow by 8% each year you wait, until maxing out at age 70.

You have substantial investments that should sustain a comfortable retirement, but plenty of things could go wrong.

The fact you’re spending all your current income is worrisome. If you don’t ratchet back your consumption a bit at retirement, you may draw down your investments at a rate that isn’t sustainable. (Depending on your investment mix, an initial withdrawal rate of 3% or 4% usually is considered “safe,” or the most you should take to minimize the odds of running out of money.)

Even if you do rein in your regular spending, bad markets or unexpected expenses could cause you to exhaust your savings faster than you expect. The longer you live, the greater the odds you’ll run short of money. Maximizing one of your Social Security benefits can be a smart way to ensure you, or your survivor, have more income when you may need it most.

Before you retire, you should consult a fee-only financial planner about the best ways to tap your retirement accounts and claim Social Security.