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Life span or life expectancy was the average length of time a lifeform would live. Male fertility in the Western world on an alternate Earth, according to a study done by the alternate Torchwood Institute, was linked to lifespan. (TV: Rise of the Cybermen)
Short-lived species Edit
For one Sontaran, twelve years was considered a "good life". (TV: A Good Man Goes to War) At the time of his death, Brak was known to be the longest-lived Sontaran in history, with a lifespan of over eighty years. (AUDIO: Old Soldiers)
Human lifespans Edit
The human lifespan varied wildly throughout history. In 1898, the average life expectancy was 49 years, 9 months and 5 days. 100 years later, it was 66 years, 5 months and 33 days. The life expectancy of Shanghai was always exactly the current average life expectancy of Earth. (TV: The Blood Line) There were also cases of humans having their lifespan extended artificially, such was the case of the heavily surgically altered Cassandra, who existed in the far future, and who once colloquially referred to not looking a day over two thousand. (TV: The End of the World) Using a time store to maintain youth, the Duchess and other former Torchwood India personnel lived for at least 100 years. (AUDIO: Golden Age) Miracle Day in 2011 stretched the human lifespan indefinitely, ceasing death, but not ageing, although this was only a temporary change. (TV: The New World) Similarly, Jack Harkness was rendered effectively immortal by the Bad Wolf; (TV: Utopia) unlike the humans during miracle day, though, he didn't age and healed almost instantly. Because of this, Jack and was known to have lived thousands of years (TV: Exit Wounds) and was suggested to be the Face of Boe, who had lived for billions of years. (TV: Last of the Time Lords) Humans converted to pig slaves, however, barely lasted weeks. (TV: Daleks in Manhattan / Evolution of the Daleks) A Time Lord mind inside a human body created a shortened lifespan for both, quickly burning up the human body and lasting perhaps days. (TV: Doctor Who, Journey's End) The Doctor and Missy shared similar views on human life; that humans should be "in a state of constant panic" (TV: The Caretaker) and that they Were "born dying" respectively. (TV: Death in Heaven)
Long-lived species Edit
Centuries-long lifespans Edit
Arcateenians were able to live for at least 200 years. They could also sustain a human host for that time, and the host would show no signs of age even long after the end of normal human lifespan. (TV: Greeks Bearing Gifts)
Millennia-long lifespans Edit
The Time Lords had extremely long lifespans. One Time Lord lived to at least 7000 years. (PROSE: Lungbarrow) The Second Doctor stated that Time Lords could live forever "barring accidents." (TV: The War Games)
The Editor of Satellite Five stated the Mighty Jagrafess of the Holy Hadrojassic Maxarodenfoe would have lived for three thousand years. The Jagrafess itself had overseen the Satellite for ninety-one years. (TV: The Long Game)
Divine and demonic entities were virtually immortal. The Olympians could live for an indefinite length of time. (COMIC: The Life Bringer) The Ancient Lights waited carefully for thirteen billion years. (TV: Secrets of the Stars) The Beast, Abaddon, Pwccm and other, similar creatures were also able to live for billions of years. (TV: The Satan Pit, End of Days, PROSE: The Twilight Streets)