From the sample data given below, remove duplicates on the combination of Name and Age and print results.

Please do not use high level API/Framework like pandas /spark-sql etc.

Solve this problem by using simple data structures given in java.

Please try to optimize the solution for efficiency in terms of space and time.

Given Dataset: Name - Age - Location

Amit - 21 - London

Cynthia -28 -Belfast

Wendy - 26- Manchester

Gareth -21 -Cardiff

Charles -29 -Edinburgh