They could simply focus on the last 150 years, bringing together the industrial age to the present day…
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First Age (Industrial Age/Belle Epoque) (1870-1914) (44 years in total) (the late imperialism of the Victorian period, the strong industrialization and the division of Africa until the Spanish-American War, the Russian Japanese War, the Italian-Turkish War and the Balkans War of 1912-1913)
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Second Age (Warrior Age/Steel Age) (1914-1945) (31 years in total) (both world wars, the rise of communism and fascism until the development of the atomic bomb)…
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Third Age (Nuclear Age) (1945-1991) (47 years in total) (the Cold War, the Space Race and the Vietnam War until the fall of the Soviet Union)
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Modern Age (1991-2035) (44 years too in total) (the arrival of the Internet and social networks and renewable energies until the arrival of man on Mars and the end of fossil fuels)