Let’s test this:
79 – 27 = 52. 52 + 40 = 92. So according to this, X is born in 1992, which is real.
79 – 28 = 51. 51 + 40 = 91. So 1991 for X is also correct.
79 – 18 = 61. 61 + 40 = 101. 2001 is right for X as well.
79 – 60 = 19. 19 + 40 = 59. 1959 is the year X was born.
79 – 37 = 42. 42+ 40 = 82. Yes that is correct for X.
So this is legit. Try it!