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.
Q: Passage: He was born in Orlovat, and attended primary school in Crepaja. After finishing his gymnasium in Pancevo (this school was later named after him), he went to Vienna to study on academy in 1876. He graduated from the Academy of Fine Arts of Vienna in 1880. He studied in the class of professor Christian Griepenkerl, who also taught Predic's contemporary Paja Jovanovic. During his studies, he received the Gundel's prize for a male model painting in oil. In 1882, he worked in private studio of professor Grieppenkerl, and in the period from 1883 to 1885 he was an assistant professor of the Department of Antiquity at the Art academy in Vienna. During that time, under the instruction of professor Grieppenkerl, and the renowned architect Theophil Freiherr von Hansen, he painted 13 wall paintings of ancient, historical and mythological compositions for the frieze in the House of Lords at Reichsratsgebaude (Imperial Council Building) in Vienna.
Link Information: Christian Griepenkerl (17 March 1839 22 March 1916) Answer: 41
A:
How old was the professor that Predic studied with in Vienna?