Who was the prime minister of uk when Pierre Trudeau was a teenager?

At the time when Joseph Philippe Pierre Yves Elliott Trudeau, PC, CC, CH, QC, MSRC, the 15th Prime Minister of Canada from April 20, 1968 to June 4, 1979, and from March 3, 1980 to June 30, 1984 was a teenager (a human being between the ages of 13 and 19 inclusive), who was the prime minister (in the government) of The United Kingdom of Great Britain and Northern Ireland (commonly known as the United Kingdom, the UK or Britain), the sovereign state located off the north-western coast of continental Europe?

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Show reasoning Reasoning

I followed this chain of reasoning:

I know from locally stored knowledge that:
Pierre Trudeau is a person ([fact: ["18791010@trueknowledge.com"]])

October 18th 1919 is the birthdate of Pierre Trudeau ([fact: ["18791007@trueknowledge.com"]])

By calculation (generator: ["timepoint_sum@trueknowledge.com"]) I know that:
October 18th 1932 is the timepoint sum of October 18th 1919 and 13 years

October 18th 1939 is the timepoint sum of October 18th 1919 and 20 years

By calculation (generator: ["teenager@trueknowledge.com"]) I know that:
Fact 1: Pierre Trudeau is a teenager

Fact 1 is true for October 18th 1932 - October 18th 1939

I know from locally stored knowledge that:
Fact 2: Neville Chamberlain is the prime minister of the United Kingdom ([fact: ["148114138@trueknowledge.com"]])

Fact 2 is true for May 28th 1937 - May 10th 1940 ([fact: ["148114142@trueknowledge.com"]])

By calculation (generator: ["overlap1@trueknowledge.com"]) I know that:
May 28th 1937 - May 10th 1940 is overlapping with October 18th 1932 - October 18th 1939

I know from locally stored knowledge that:
Fact 3: Neville Chamberlain is a person ([fact: ["18380090@trueknowledge.com"]])

By calculation (generator: ["permanent@trueknowledge.com"]) I know that:
Fact 3 is true for all time

I know from locally stored knowledge that:
person is a subclass of entity that is capable of deliberate action ([fact: ["129969855@trueknowledge.com"]])

permanent applies to person ([fact: ["1131338@trueknowledge.com"]])

By calculation (generator: ["iaif1@trueknowledge.com"]) I know that:
Fact 4: Neville Chamberlain is a entity that is capable of deliberate action

Fact 4 is true for all time

I know from locally stored knowledge that:
Fact 5: Ramsay MacDonald is the prime minister of the United Kingdom ([fact: ["666931408@trueknowledge.com"]])

Fact 5 is true for June 5th 1929 - June 7th 1935 ([fact: ["666931420@trueknowledge.com"]])

By calculation (generator: ["overlap1@trueknowledge.com"]) I know that:
June 5th 1929 - June 7th 1935 is overlapping with October 18th 1932 - October 18th 1939

I know from locally stored knowledge that:
Fact 6: Ramsay MacDonald is a person ([fact: ["18488537@trueknowledge.com"]])

By calculation (generator: ["permanent@trueknowledge.com"]) I know that:
Fact 6 is true for all time

By calculation (generator: ["iaif1@trueknowledge.com"]) I know that:
Fact 4: Ramsay MacDonald is a entity that is capable of deliberate action

Fact 4 is true for all time

I used the following facts to provide this answer:

Pierre Trudeau is a person

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October 18th 1919 is the birthdate of Pierre Trudeau

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Neville Chamberlain has been the prime minister of the United Kingdom between May 28th 1937 and May 10th 1940

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Neville Chamberlain is a person

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Ramsay MacDonald has been the prime minister of the United Kingdom between June 5th 1929 and June 7th 1935

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Ramsay MacDonald is a person

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