Part 2 of our four-part Aging in America series looks at one of the realities that comes with longer life: how individuals, families, and the country prepare financially for decades that earlier generations rarely had to plan for.

Living longer sounds wonderful.

Paying for a longer life is more complicated.

Imagine someone retires at 65 and lives to 90.

That’s 25 years of housing, food, utilities, transportation, insurance and healthcare—potentially without a traditional paycheck.

Now multiply that challenge across millions of Americans.

This is one of the central economic questions created by an aging country:

How do we finance longer lives?

Retirement Has Changed

When many of America’s retirement institutions were created, retirement often represented a much shorter period of life.

Today, reaching 65 doesn’t necessarily mean someone is approaching the end of life.

For many people, it can be the beginning of another 20 years or more.

That’s good news.

But financially, those additional years matter enormously.

A retirement portfolio that needs to support someone for ten years is very different from one that might need to last thirty.

And no one knows exactly how long he or she will live.

That uncertainty makes retirement planning unusually difficult.

Social Security Becomes More Important

For millions of older Americans, Social Security isn’t simply a bonus added to retirement savings.

It is a central part of retirement income.

As America’s population ages, however, the relationship between workers paying into the system and retirees receiving benefits changes.

That doesn’t mean Social Security suddenly disappears.

It does mean policymakers will continue facing difficult choices involving taxes, benefits, retirement ages and the program’s long-term finances.

None of those choices are particularly easy.

Then Comes Healthcare

Older adults generally use more healthcare than younger adults.

That means an aging population affects Medicare, hospitals, physicians, prescription drugs and the federal budget.

But there’s an important distinction.

Living longer isn’t necessarily the same thing as living healthier.

If additional years are healthy and independent, longer life can be tremendously positive.

If those additional years involve serious chronic illness and intensive medical care, the financial and human costs can be much greater.

So one of America’s most important investments may not simply be extending lifespan.

It may be extending healthspan—the portion of life spent in reasonably good health.

The Expense Families Don’t Always Expect

Then there is long-term care.

A person may eventually need help bathing, dressing, preparing meals, taking medications or simply moving safely around the house.

That help has to come from somewhere.

Sometimes it comes from paid professionals.

Often it comes from family.

And that’s where the economics of aging become less visible.

A daughter reduces her work hours to care for her mother.

A son turns down a promotion because he needs to remain nearby.

A spouse becomes a full-time caregiver without ever receiving a paycheck.

Those decisions don’t necessarily appear in government healthcare spending.

But they have an economic cost.

Working Longer May Become Normal

Retirement at 65 has become embedded in American culture.

But longer lifespans may gradually change that expectation.

Some people will work longer because they need the money.

Others will do it because they enjoy working, want social interaction or aren’t ready to stop contributing.

That could change employers as well.

Companies accustomed to recruiting younger workers may need to become better at retaining employees in their 60s and 70s.

Flexible schedules, part-time roles and phased retirement could become much more common.

The Longevity Question

America achieved something remarkable: millions of people now have the possibility of living long lives.

But we haven’t completely redesigned our financial systems around that reality.

Perhaps that’s the central challenge.

We still tend to think about a lifespan with three large chapters:

Education. Work. Retirement.

Longer life may require more chapters than that.

The goal shouldn’t simply be finding enough money to support old age.

It should be creating a system in which longer lives remain financially sustainable—for individuals, families and the country.

Next in Our Aging Population: When the Family Becomes the Caregiver — the largely invisible work happening inside millions of American homes.