Teacher:In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
Teacher: Now, understand the problem? Solve this instance: Passage: In 1902, when Herzfeld was 10 years old, he was enrolled in the private Gymnasium Schottengymnasium, which was run by the Benedictine Order of the Roman Catholic Church and had its name derived from the fact that the founders came from Scotland. He attended this school until 1910, when he began attending the University of Vienna to study physics and chemistry. In 1912, he took courses at the University of Zurich and the Eidgenossische Technische Hochschule Zurich (ETH). It was in Zurich he met Otto Stern, who was at the ETH; Herzfeld later credited conversations with Stern for his deeper understanding of thermodynamics. In 1913, he went to study at the University of Gottingen, after which Herzfeld returned to Vienna, and was granted his doctorate in 1914, under Friedrich Hasenohrl, who had become Director of the Institute for Theoretical Physics, upon the suicide of Ludwig Boltzmann in 1906.
Link Information: Friedrich Hasenohrl (; 30 November 1874 7 October 1915), was an Austrian physicist. Answer: 40
Student:
How old was Friedrich Hasenohrl the year that Herzfeld returned to Vienna, and was granted his doctorate?