And the iq of the old man is?

Lewis Terman (1916) developed the original notion of IQ and proposed this scale for classifying IQ scores:

  Over 140 - Genius or near genius
  120 - 140 - Very superior intelligence
  110 - 119 - Superior intelligence
  90 - 109 - Normal or average intelligence
  80 - 89 - Dullness
  70 - 79 - Borderline deficiency
  Under 70 - Definite feeble-mindedness 

Normal Distribution & IQ Scores

The properties of the normal distribution apply to IQ scores:

  50% of IQ scores fall between 90 and 110
  70% of IQ scores fall between 85 and 115
  95% of IQ scores fall between 70 and 130
  99.5% of IQ scores fall between 60 and 140 

So the short answer would be yes.

-Goran