Gertrude who wrote "We are always the same age inside" (5)

I believe the answer is:

stein

(Other definitions for stein that I've seen before include "Earthenware beer jug" , "Inset into earthenware mug for beer" , "Glass" , "German tankard" , "German earthenware beer mug" .)

I've seen this clue in The New York Times.

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