Question: What was Einstein's age when he died?
About the article "Albert Einstein", section "Modern quantum theory".

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On 17 April 1955, Albert Einstein experienced internal bleeding caused by the rupture of an abdominal aortic aneurysm, which had previously been reinforced surgically by Dr. Rudolph Nissen in 1948.
He took the draft of a speech he was preparing for a television appearance commemorating the State of Israel's seventh anniversary with him to the hospital, but he did not live long enough to complete it.
Einstein refused surgery, saying: "I want to go when I want.
It is tasteless to prolong life artificially.
I have done my share, it is time to go.
I will do it elegantly."
He died in Princeton Hospital early the next morning at the age of 76, having continued to work until near the end.
During the autopsy, the pathologist of Princeton Hospital, Thomas Stoltz Harvey, removed Einstein's brain for preservation without the permission of his family, in the hope that the neuroscience of the future would be able to discover what made Einstein so intelligent.
Einstein's remains were cremated and his ashes were scattered at an undisclosed location.
In his lecture at Einstein's memorial, nuclear physicist Robert Oppenheimer summarized his impression of him as a person: "He was almost wholly without sophistication and wholly without worldliness ...
There was always with him a wonderful purity at once childlike and profoundly stubborn."
Max Talmey (1869–1941) was a Polish ophthalmologist best known for mentoring Albert Einstein and his success in treating cataracts.
Born into a poor Jewish family, Talmey first met Albert Einstein when Einstein was ten years old.
Talmey was then attending Medical School in Germany.
Talmey was a weekly lunch guest of Einstein's family.
He gave Albert Einstein a number of books about science, including works by Aaron Bernstein.
Talmey published an account of Einstein's early life, "Personal Recollections of Einstein's Boyhood and Youth", in "Scripta Mathematica".
He also published an account of the Einstein's Theory of Relativity.
Talmey moved to Mount Sinai Hospital in 1895 where he served as an Ophthalmologist.
He published scholarly works on cataracts and infant paralysis.
In addition to his medical career, Talmey was a harsh critic of Psychoanalysis.
He also supported the development of Esperanto, and also constructed his own language, which he called Gloro.
He performed public readings of works translated into Gloro, which had similarities to Latin and Spanish.
He died in 1941. 
When Einstein published his seminal 1905 paper on the particle theory of light, Millikan was convinced that it had to be wrong, because of the vast body of evidence that had already shown that light was a wave.
He undertook a decade-long experimental program to test Einstein's theory, which required building what he described as "a machine shop "in vacuo"" in order to prepare the very clean metal surface of the photo electrode.
His results confirmed Einstein's predictions in every detail, but Millikan was not convinced of Einstein's interpretation, and as late as 1916 he wrote, "Einstein's photoelectric equation... cannot in my judgment be looked upon at present as resting upon any sort of a satisfactory theoretical foundation," even though "it actually represents very accurately the behavior" of the photoelectric effect.
In his 1950 autobiography, however, he simply declared that his work "scarcely permits of any other interpretation than that which Einstein had originally suggested, namely that of the semi-corpuscular or photon theory of light itself".
Since Millikan's work formed some of the basis for modern particle physics, it is ironic that he was rather conservative in his opinions about 20th century developments in physics, as in the case of the photon theory.
Another example is that his textbook, as late as the 1927 version, unambiguously states the existence of the ether, and mentions Einstein's theory of relativity only in a noncommittal note at the end of the caption under Einstein's portrait, stating as the last in a list of accomplishments that he was "author of the special theory of relativity in 1905 and of the general theory of relativity in 1914, both of which have had great success in explaining otherwise unexplained phenomena and in predicting new ones.
"Millikan is also credited with measuring the value of Planck's constant by using photoelectric emission graphs of various metals. 
Bernard Einstein was the son of Hans Albert Einstein and Frieda Einstein (née Knecht), who had married in 1927 in Switzerland.
Bernard Einstein was born on July 10, 1930 in Dortmund, Germany where Hans Albert was involved in a bridge building project.
Hans Albert was the only one of Albert Einstein's three children to marry and have children.
Hans Albert's sister, Lieserl Einstein, is assumed to have died in infancy, although it has been suggested that she was given up for adoption.
Hans Albert's younger brother Eduard Einstein developed severe schizophrenia in early adulthood and died at age 55, and had no children.
Bernard's brother, Klaus, was born in 1932 and died at age 6 of diphtheria in Clemson, South Carolina, United States.
Frieda had two more sons that died in early infancy.
Eventually Hans Albert and Frieda adopted a girl, Evelyn, shortly after she was born in 1941.
One year after Frieda died in 1958, Hans Albert married Elizabeth Roboz, a neurochemist.
Bernard spent his early years in Switzerland until the age of eight when his family moved to South Carolina.
Albert Einstein was very worried about the rise of Nazi Germany and encouraged his son Hans Albert to emigrate to the United States as he himself had done in 1933.
Hans Albert heeded this advice, and moved his family to Greenville, South Carolina where he was a civil engineer working with the US Corps of Engineers.
Bernard spent his teenage years in Pasadena where his father was a professor at the California Institute of Technology, and in Berkeley, where his father was a professor at the University of California.
Bernard first met his grandfather Albert when he was two years old.
As a boy he travelled alone to spend time with Albert in New Jersey, and at Saranac Lake in upstate New York.
Bernard recounted to his son Thomas that he used to irritate his grandfather because he would urinate out the window directly above Albert's study in Princeton.
At Saranac Lake he enjoyed sailing with his grandfather.
Apparently Albert Einstein's favorite time to sail was when there was very little wind.
According to Bernard, his grandfather enjoyed the challenge of harnessing whatever little bit of breeze he could capture.
The sailing tradition was carried on by Albert's son, Hans Albert who loved to sail with Bernard, and Bernard's children on the San Francisco Bay.
Albert Einstein died in April 1955.
Having shared his love of music with his grandson, he bequeathed Bernard his violin in addition to a modest sum of money.
Bernard's children are Thomas, Paul, Eduard, Mira, and Charles. 
Harris was born on October 23, 1909 in Balta, Russian Empire.
In 1913 when he was four years old his family immigrated to Philadelphia, Pennsylvania.
At age 13, at his request, he was sent to live in Palestine, where he worked to support himself, and throughout his life, he returned frequently to live on a socialist kibbutz in Israel.
His brother was Dr. Tzvi N. Harris, who with his wife Shoshana played a pivotal role in the understanding of the immune system and the development of modern immunology.
His sister, Anna H. Live, was Director of the English Institute (for ESL students) at the University of Pennsylvania (now named the English Language Program).
In 1941, he married the physicist Bruria Kaufman, who was Einstein's assistant in the 1950s at Princeton.
In the 1960s the couple established residence in Israel and lived in kibbutz Mishmar Ha'Emek, and adopted their daughter, Tamar.
From 1949 until his death, Harris maintained a close relationship with Naomi Sager, director of the Linguistic String Project at New York University.
Their daughter, Eva Harris, is a professor of Infectious Diseases at the University of California, Berkeley, and the President of the non-profit organization Sustainable Sciences Institute.
Harris died in his sleep after a routine working day at the age of 82 on May 22, 1992, in New York.