Dunno what screenshot you're looking at, but there are no percentages in the one I quoted.

Seen one of the sites i went to was false flagged, So i will retract that statement completely.
Here are some quick google searches i found though.

The paragraph in the first image says, in full

"Scientists have long known that our ability to think quickly and recall information, also known as fluid intelligence, peaks around age 20 and then begins a slow decline. However, more recent findings, including a new study from neuroscientists at MIT and Massachusetts General Hospital (MGH), suggest that the real picture is much more complex. The study, which appears in the journal Psychological Science, finds that different components of fluid intelligence peak at different ages, some as late as age 40."

You are reading cherry picked information.

Would it be fair to state the following:

Both rare and common cases you can see cognitive and constructive thinking peak at different ages ?

18-43 being the gap ofcourse

Sure, but that's an insanely wide gap that doesn't lend itself to clean conclusions. Cognitive decline with age isn't a clean process that we can really use for much until the person is far past their prime.

Agreed, Mostly due to the fact that the science behind this has changed alot in the last 5 years and has been more reliable than anytime before 2017.