Could my IQ score be legitimately 138?

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When I was 5 years old I took a DAP test and scored a mental cognitive ability of 6 years and 9 months. I heard you can calculate your IQ by Chronological age/ mental age *100 so would that make my IQ 138 or an estimate of it?

Wouldn't the mental age variable have to remain a constant to make such a calculation? A lot of times people with a high intellect who have autism do poorly on IQ tests because they seem to be based more on measuring perception rather than raw intellect. Having perceptual problems was part of my childhood diagnosis. I think I did poorly on standardized IQ tests because of it. I took an online IQ test for fun once. It said I was a 122.

IQ isn't calculated that way anymore. Also IQ changes so your score today won't be related to your score at age 5.

the MENSA mini-IQ, or "Workout," test says I may have an IQ of around 140. My husband took it, and he got around 120.
I was never given any standardized IQ tests... the closest thing I got to that were the regular seventh grade subject tests that showed that I was above average in all subjects and above the 12th grade level in reading and writing.

Who cares? But age to do an IQ test is not 5 but 7.5

The standing belief is that your IQ doesn't change much over time, but there is the idea of "neuro-plasticity" where one can supposedly reorganize the brain to gain a higher IQ and reasoning ability through practice. Personally I think both can be true. IQ won't get you much by having it measured unless you need it to enter some sort of society/job/activity where it is a requirement. MENSA takes IQ scores from some tests no matter the age when you took it as long as it qualifies (I don't see DAP listed on their site). The only good that might do you is finding people with similar interests and knowledge to share, and the various discounts you get from being a member.

I took the online test on emode/tickle/testq (the site has changed names/owners over the years) which gave me a 146, while my step-mother who is a registered nurse received a 126 and my then girlfriend received a 104. I was in gifted and talented at school off and on, but I don't know if 146 would be accurate, but the scores for my step-mother and girlfriend seemed fairly close. I might try to take an official one sometime for fun.

Best to take new test. If you score lower it is ok. Some people do have lower scores with advance age. The score can be with in the range of 10-/10+ points.

The Weschler IQ test tends to give lower scores to individuals with Asperger's because it requires a lot of manual tasks and sensory integration (hitting at the core of dyspraxia) while the Raven Matrices test tends to give higher scores to individuals with Asperger's. (I saw a study on this but am too lazy to dig it up).

The test given to children in school is often similar to the Raven test while, typically, the official test administered to adults in a clinical setting is typically the Weschler test. This is why it may appear as if IQ scores decline with age while, in reality, it may just be a different test.

This is why many individuals diagnosed with Asperger's as adults often show up as having barely average IQ's but were in the gifted programs in school.