Not sure of her birth date;

There are 9 births of Ross girls in Torkshire with Marie as a forename from 1952 to 1972.  Of these only one has the name of Marie on its own:

Last Name First Name Born Died Event Record set  Location
Ross Marie 1969 — 1969 England & Wales Births 1837-2006  Hemsworth, Yorkshire, England

But I am not sure Hugh’s wife came from Hemsworth.  A marriage certificate would help to identify her birth, with her age and her father’s name.
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Their marriage index:

First name(s) HUGH
Last name GREENAN
Marriage quarter 2
Marriage year 1988
Registration month 6
HUGH GREENAN married one of these people
M arie Ross
Spouse's last name Ross
District Central Cleveland
County Yorkshire (recte: Cleveland)
Country England
Volume as transcribed 3
Page number 2023
Record set England & Wales Marriages 1837-2005
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