Question

She was married ____ an earlier age (fill preposition )

Answer 1

She was married at an earlier age.

• There is confusion when we use two prepositions 'in', 'at'. Basically, the preposition 'in' is used to describe something inside a particular structure or building whereas the preposition 'at' is used to describe a particular location or particular time.
• For this sentence, as it is told about 'an earlier age' so it is telling about time. Therefore 'at' will be the appropriate one.

Answer 2

Answer:

She was married at an earlier age

Hope it helps :)