Political midlife crisis

A political midlife crisis is a turning point or watershed moment in the fortunes of a governance entity such as an empire, nation, faction, political party, or international alliance. The concept was first advanced by Arab thinker Ibn Khaldun (1332–1406), who compared an individual's decline after reaching the age of forty, with the sedentary decline that occurs in a dynasty. More recently, political scientist Joshua S Goldstein has used the concept in his 1988 book, "Long Cycles: Prosperity and War in the Modern Age".
A political midlife crisis occurs following a prolonged golden age of expansionism, optimism, economic progress, conquest, or other success, and typically features attacks on, or threats toward, a rival power. The attacks are vigorously opposed, ending in stalemate or defeat.
Political midlife crisis" is parallel to "midlife crisis" in a middle-aged person's identity and self-confidence, caused by the person's aging, mortality, and any perceived deficiencies in life attainments. Political midlife crisis applies the concepts of "social organism" and "body politic", which view an entire human society as a kind of single super-organism.
History of the concept.
Ibn Khaldun, in the "Muqaddimah" (1377), set out a general theory of the rise and fall of regimes. A ruthless conqueror with a 
"desert attitude" establishes a new dynasty. Over some years, royal authority and "asabiyyah" (social cohesion) enable "expansion to the limit". Then, as in the life of an individual, a turning point is reached. According to Ibn Khaldun, when a man reaches forty he naturally stops growing, then begins to decline. The same is the case with a sedentary civilization's culture. The dynasty's new sedentary culture fosters a love of luxury and pomp. The people become over-taxed and acquire a "habit of subservience". Their rulers subvert property rights and become weak, dishonest, and divided. Finally, after three generations—equivalent to a human lifespan—the dynasty becomes "senile and coercive". There may follow a final "brightly burning show of power", but collapse of the dynasty is inevitable. A new dynasty takes over, and the cycle continues. Ibn Khaldun says: "This senility is a chronic disease that cannot be cured, because it is something natural."
In 1988, Joshua S Goldstein advanced the concept of the political midlife crisis in his book on "long cycle theory", "Long Cycles: Prosperity and War in the Modern Age", which offers four examples of the process:
Following Al Qaeda's attacks on the United States on September 11, 2001, and the United States' subsequent inconclusive wars in Afghanistan (2001–present) and Iraq (2003–2011), initiated by US President George W. Bush, Professor Gary Weaver and his co-author Adam Mendelson, writing in 2008, cited a survey of 109 historians, 99% of whom rated Bush a "failure" as president, two-thirds rating him the "worst ever". Weaver and Mendelson wrote that the United States had been in its "childhood" before 1898; in its "adolescence", 1898–1945; in "young adulthood", 1945–1991; in "adulthood", 1991–2001. Weaver and Mendelson, from their 2008 perspective, anticipated that the traumas of the George W. Bush presidency would "season [the United States] with new strength, wisdom and maturity", enabling it to move forward from this political midlife crisis.
The European debt crisis (2009–present) has been called the European Union's midlife crisis in articles by Gideon Rachman, Roland Benedikter, and Natalie Nougayrède.
Other examples.
Leo Tolstoy, in "War and Peace", wrote about the 1812 French invasion of Russia: "What is the cause of this movement which took the French army all the way from Paris to Moscow, and then back to Paris? A system, a mysterious callous force ... the unconscious swarm-life of mankind." The French decision to invade Russia in 1812 had been intended to secure a Franco-Russian alliance that would then conquer India, but it ended in a rout and in the exile of Bonaparte—prompting Stanley Michalak to write that "In 1812 Napoleon failed the supreme test of power politics—knowing when to stop."
The 1919 Amritsar massacre in colonial India marked a turning point for the Indian independence movement as many Indians which had hitherto been supportive of colonial rule changed their minds in disgust. Similarly, the 1960 Sharpeville massacre in apartheid-era South Africa brought on a state of emergency and drove the African National Congress underground and into armed struggle. 
Egypt's defeat in the 1967 Six-Day War with Israel was a political turning point for Egypt's President Gamal Abdel Nasser and for the Arab cause. Nasser immediately offered his resignation and died three years later; the cause of Arab nationalism never recovered. Mark Katz describes the event as a "crisis of confidence from which [Egypt] never recovered".
An "Economist" article was one of the first to recognize the nature of the 2007–08 credit crunch. Beáta Farkas sees the Euro crisis as another financial turning point.
In India the BJP party is alleged to have suffered a midlife crisis in recent years , while in Bangladesh a midlife crisis allegedly occurred following a controversial 2012 trial 
According to professor Tom Nicholls, Vladimir Putin has led Russia to the 'most dangerous' midlife crisis of recent times .
Nations at risk.
"The Economist" says it is a "question of when, not if, real trouble will hit China". The country is approaching the limits of its potential power and growth, having in 2010 reached the Lewis turning point, an indicator of labour shortages.