7-13-2000 = VII-XIII-MM
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The date of birth 19101989 in Roman numerals is XIX.X.MCMXCIX.
The date of birth 05041971 in Roman numerals is V.IV.MCMLXXI.
Under today's rules: September-XXVII-MCMLXXX September is the IX month.
I would convert them back into Hindu-Arabic numerals, do the addition and then convert the answer to Roman numerals.