The following was developed as a mental age assessment by scientists at a very prestigious university in the United States.
Take your time. See if you can read each line aloud without making a mistake. The average person over 40 years of age cannot do it!
1 This is this cat.
2. This is is cat.
3. This is how cat.
4. This is to cat.
5. This is keep cat.
6. This is an cat.
7. This is old cat.
8. This is fart cat.
9. This is busy cat
10. This is for cat.
11. This is forty cat.
12. This is seconds cat.
You are not done yet. Now go back and read the third word in each line from the top down.