Middle age is often seen as life's pivot point. A hill has been climbed and the view over the other side is unsettling. As Victor Hugo said: "40 is the old age of youth" and "50 the youth of old age".

The idea adults in midlife face a dark night of the soul - or desperately escape from it, hair plugs flapping in a convertible's breeze - is deeply rooted. Studies show most people believe in the reality of the so-called "midlife crisis" and almost half of adults over 50 claim to have had one. But is it real?

There is good evidence a midlife decline in life satisfaction is real. Population surveys typically find both women and men report the lowest satisfaction in middle age. One major survey locates the lowest life satisfaction at age 45 and the Australian Bureau of Statistics says the 45-54 age bracket is the glummest.

Middle age may be dislocating for some but there is little evidence it is usually a period of crisis and despondency. Psychologically speaking, things tend to get better. If there is a small dip in how people evaluate their lot, this is understandable. Our attention shifts from time past to time left, and that requires adjustment.

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When is midlife?

Clearly there are many grounds for being unsatisfied with life during the middle years. But does that make the midlife crisis real, or just an intuitively appealing phantom? There is good reason to be sceptical.

For one thing, it's hard enough deciding when the midlife crisis should occur. Concepts of middle age are elastic and change as we get older. One study found younger adults believe middle age stretches from the early 30s to 50, whereas adults over 60 saw it as the late 30s to mid-50s.

In one US study a third of people in their 70s defined themselves as middle-aged. This research accords with a finding middle-aged people tend to feel one decade younger than their birth certificate.

However we define midlife, do crises concentrate in that period? One study suggests not. It indicates instead that self-reported crises simply become steadily more common as we age. Among study participants in their 20s, 44 per cent reported a crisis, compared to 49 per cent of those in their 30s, and 53 per cent of those in their 40s.

In another study, the older the participants, the older they reported their midlife crisis to have occurred. People over 60 recalled theirs at 53 while those in their 40s put it at 38.

Arguably there is no distinct midlife crisis, just crises that occur during midlife but might equally have occurred before or after.

What the theorists thought

The psychoanalyst Elliot Jaques, who coined the term "midlife crisis" in 1965, thought it reflected the dawning recognition of one's mortality: "Death instead of being a general conception, or an event experienced in terms of the loss of someone else, becomes a personal matter."

The key achievement of middle age, according to Jaques, is to move beyond youthful idealism to what he called "contemplative pessimism" and "constructive resignation". He argued midlife was when we reach maturity by overcoming our denial of death and human destructiveness.

Carl Jung argued midlife was a time when previously suppressed aspects of the psyche might become integrated. Men could recover their unconscious feminine side or anima, previously submerged in their youth, and women come alive to their hidden opposite, the animus.

Less profound explanations have also been offered for midlife dissatisfaction. It's when children may be leaving the home and when adults are generationally sandwiched, required to care for children and ageing parents. Chronic illnesses often make their first appearance and losses accelerate. Workplace demands may be peaking.

But there may be something to it that's even more basic and biological. Chimpanzees and orangutans aren't known to suffer from existential dread, empty nest syndrome or job stress. And still, they show the same midlife dip in wellbeing as their human cousins.

One study found chimps in their late 20s and orangutans in the mid 30s showed the lowest mood, the least pleasure in social activities, and the poorest capacity to achieve their goals.

Midlife as a time of growth, not crisis

Crisis episodes may not be tightly tied to adverse life events. Research often fails to show clear connections between adversities and self-proclaimed crises.

One study found reporting a midlife crisis was not associated with recently experiencing divorce, job loss or death of a loved one, and was primarily linked to having a history of depression.

The idea middle age is a time of psychological gloom is also belied by research evidence. The U-shaped life satisfaction curve notwithstanding, most change in midlife is positive.

Consider personality change, for example. One study that followed thousands of Americans from age 41 to 50 found they became less neurotic and self-conscious with age. These changes were unrelated to experience of life adversity: resilience, not crisis, was the norm.

The challenge is to come out the end of middle age with life satisfaction restored, as most do.

Nick Haslam, Professor of Psychology, University of Melbourne

- The Conversation