Definition: 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.
Input: Passage: The younger son of John Hamilton, 1st Marquess of Abercorn, he was evidently educated at Harrow School, where he was a lieutenant of volunteers in 1803. He matriculated at Christ Church, Oxford on 24 October 1805, but left there for Cambridge, where he was admitted as a nobleman to St John's College on 19 October 1807. In the mean time, he was elected as Member of Parliament for Dungannon at the general election in May 1807, though underage, through the patronage of his father's political ally, Thomas Knox, 1st Viscount Northland. It was intended that he should later contest County Donegal or County Tyrone, but he suffered from illness, and may not ever have taken his seat. In January 1808, he sailed for Brazil in the brig Eclipse to recover his health, but died in Madeira in June.
Link Information: he was elected as Member of Parliament for Dungannon at the general election in May 1807 Answer: 51
Output:
How old was John Hamilton, 1st Marquess of Abercorn, when his younger son was elected to Parliament?