What is an average IQ for an adult 50 and over?

The average IQ for all people at all ages is a standard score of 100. The average range for some tests (such as the KABC-2) includes standard scores from 85 - 115. For some tests (such as the WISC-IV, WPPSI-III, WAIS, WNV, SB5) is 90 - 109. Either way, 100 is dead average.