Conditional Input In A Cell Based On Data In Two Different Cells And Other Values

I have lot of data in three columns like this. The first column is "Name", the second is "Comment" wherein I want the macro to write some comment, the third one is DOB. The problem is that the names in column 1 repeats many times. I want a macro to write in column B "either Old or Older or Oldest" based on the Name and DOB. Thus David with DOB 13 Sep 1982 be marked Oldest in Column B and David with DOB 25 Aug 1988 be marked Older and David with DOB 24 May 1990 be marked Old. Similarly William and Rita should be marked either old or older or oldest. As the data are enormous I do not want to refer the actual name in the programming. I want to call them using a variable in programming.

NameComment DOB
David 25 August 1988
David 13 September 1982
David 24 May 1990
William 24 March 1980
William 25 July 1987
William 13 August 1989
Rita 17 July 1990
Rita 24 April 1989
Rita 13 June 1988
The example file is attached