The average IQ is 100, a score of 112 is slightly below the first standard deviation which suggests you scored higher than about 70% of people.
yes.
Yes, that score is above average. Age is not a relevant factor in comparisons. IQ scores are normalized by age, thus theoretically if you got an IQ score of 138 you should always get an IQ score of...
No. 100 is average for any age.... age is a factor in calculating IQ. Across all groups, 100 is the average.
Yes because an average person's IQ is 100.