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When did the Old Prussian language die out?

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Historical map showing the unification of Germany by Prussia in the late 19th century. The map highlights in green the Kingdom of Prussia as of 1866, and in yellow the additional territories that formed the German Empire by 1871-1918, encompassing most of north-central Europe. Neighboring countries such as France, Belgium, the Netherlands, Denmark, Sweden, Russia, Austria-Hungary, and Switzerland are labeled, with major regions and states within the empire clearly marked. — Prussia The unification of Germany by Prussia, which brought most of north-central Europe into one kingdom.

The Old Prussian language is generally considered to have died out during the 17th century.12

While the Teutonic Order began the conquest of Prussian lands in the 13th century, leading to a long process of Germanization, the indigenous language persisted among the local population for several centuries. By the 18th century, this process of assimilation was considered complete.32