How old was Albert II, Duke of Saxony when Albert I, Duke of Saxony died?

What was the age (length of time since creation) of Albert II of Saxony (Wittenberg, ca. 1250 – 25 August 1298, near Aken), the son of Duke Albert I of Saxony and Helen of Brunswick and Lunenburg, a daughter of Otto the Child at the time Albert I (c. 1175 – 7 October 1260), the Duke of Saxony, Angria, and Westphalia; Lord of Nordalbingia; Count of Anhalt; and Prince-elector and Archmarshal of the Holy Roman Empire is someone who died on?

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I followed this chain of reasoning:

I know from locally stored knowledge that:
1260 is the date of death of Albert I, Duke of Saxony ([fact: ["696148744@trueknowledge.com"]])

1250 is the birthdate of Albert II, Duke of Saxony ([fact: ["696488364@trueknowledge.com"]])

By calculation (generator: ["human_age@trueknowledge.com"]) I know that:
Fact 1: 10 years old is the age of Albert II, Duke of Saxony

Fact 1 is true at 1260

Fact 1: 10 years old is a age

Fact 1: 10 years old applies to Albert II, Duke of Saxony

Fact 1 is true at 1260

I used the following facts to provide this answer:

1260 is the date of death of Albert I, Duke of Saxony

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1250 is the birthdate of Albert II, Duke of Saxony

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