Cadets eat lunch March 6 in the cadet mess hall in Washington Hall at the United States Military Academy at West Point, N.Y.

West Point, N.Y. ? A father in the American heartland agonizes as his son prepares for a second tour in Iraq. Baghdad morgue workers wash bodies for burial after a suicide attack. Army cadets study the shifting tactics of Iraqi insurgents for a battle they will inherit.

Snapshots from a war at its fifth year. Each distinct, each a narrative in itself – gnawing fear, raw violence, youthful resolve. Yet all linked by a single question.

How much longer?

Most likely, the war will go on for years, say many commanders and military analysts. In fact, it’s possible to consider this just the midpoint. The U.S. combat role in Iraq could have another half decade ahead – or maybe more, depending on the resilience of the insurgency and the U.S. political will to maintain the fight.

Iraq, experts say, is no longer a young war. Nor it is entering an endgame. It may still be in sturdy middle age.

“Four years, optimistically” before the Pentagon can begin a significant troop withdrawal from Iraq, predicted Eric Rosenbach, executive director of the Center for International Affairs at Harvard’s Kennedy School, “and more like seven or eight years” until Iraqi forces can handle the bulk of their own security.

What that means depends largely on your vantage point.

For the Pentagon, it’s about trying to build up a credible Iraqi security force while struggling to support its own troop levels in a military strained by nonstop warfare since 2001. During a trip through the Persian Gulf last year, Adm. William Fallon, then head of U.S. Central Command, was peppered with as many questions about resources as about strategies moving ahead.

For many Americans, it’s about a rising toll – nearly 4,000 U.S. military deaths and more than 60,000 wounded – with no end in sight. Iraqis count their dead and injured in much higher figures – hundreds of thousands at least – and see entire neighborhoods changed by the millions who have fled for safer havens.

For others, it’s about an ever-mounting loss of goodwill overseas: “We’ve squandered our good name,” says 29-year-old Ryan Meehan, sitting in a St. Louis coffee shop.

You can also frame the war in terms of the cost to the treasury: $12 billion a month by some estimates, $500 billion all together, and the prospect of hundreds of billions more.

But then there’s other measures of the war as it enters its sixth year.

These are more difficult to weigh – yet are just as real and profound – and are found in places such as Jim Durham’s home in Evansville, Ind. He tries to fight off a sense of dread as he watches his 29-year-old son prepare for his second tour in Iraq with the Indiana National Guard.

Durham, 59, struggled to describe the emotions. He decided: “It’s like watching somebody with a disease.”

“Perhaps they can live, perhaps they can’t,” he said. “Maybe they’ll survive. Maybe they won’t. And there’s nothing you can do about it.”

Already, the war has lasted longer than the U.S. fight in World War II and Korea. And if many experts are to be believed, the Iraq war will follow roughly a 10-year arc, ending only after a new crop of soldiers – some now barely into their teens – is on the battlefield.

Certainly, the Democratic candidates have called for a rapid and comprehensive withdrawal from Iraq. Hillary Clinton has said a serious troop withdrawal would begin “in the first 60 days” of her administration; Barack Obama has promised to have combat troops “out within 16 months.”

But there are many doubts that Iraqi forces will be ready to take over so soon.

“Can Iraq actually hold this together as we disappear?” a skeptical retired Gen. Barry McCaffrey asked last week, in an address in New York to mark the five-year war anniversary.

The idea that the Iraq war has only reached its midpoint is based on historical templates.

Many military strategists cite a nine- to 10-year average for insurgencies, with expected drop-offs in recruitment and core strength after a decade.

At West Point, professor Brian Fishman is an expert in al-Qaida. He tells his cadets that Iraq war is now fundamentally “a collection of local wars” to preserve key local alliances with Iraqi groups and keep pressure on insurgents from regaining footholds.

“Iraq is a fight that, no doubt, is evolving,” said Fishman after teaching his class for the Combating Terrorism Center at the U.S. Military Academy. “But when you talk about some kind of end for American troops, it’s certainly in terms of years.”

The cadets in his class were in high school the first U.S. bombs fell on Iraq. They know they could be well into their military careers before it’s over.