The answer will depend on the degree to which the number is rounded. Without any indication of that, it is not possible to answer the question sensibly.
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Someone celebrating their 72nd birthday in 2018, was born in 1946.
2018 − 1937 = 81 years
The 31st January 2018 was a wednesday.
2018-1998 = 20 years
MMXVIII = 2,000 + 10 + 5 + 3