118 and I'm only 16, I'd say I did pretty well. Cheesy
Your IQ does not change as you get older
You can do things to IMPROVE it of course, but in general your IQ when you are 3 years old will change very little to when you are 103.
Hm? how is that? I'm sure that when someone that is 5 years old takes one of these tests and scores poorly on it(say ~80), he achieved such a score due to his lack of knowledge to such types of puzzles or questions. Therefore, the more one learns the greater knowledge one gains to solve such situations as an IQ test. I seriously doubt someone doesn't increase their intelligence as they grow if they try since "with age comes wisdom".
The IQ system is based around one's intelligence. Hence, someone who scores 3/10 on a test may get the same score as someone who is 35 and scored 8/10, which may also be the same as someone who is 95 and scored 6/10. The real IQ tests are adjusted for age.
Also, there are IQ tests made specifically for children to test their IQ, tests they will understand. Many children are given these tests during kindergarten and their early years of primary school.
My IQ before I went to school was 142. Now it 141, 15 years later.