What's the earliest age one can be tested for learning disorders and can these disorders be identified and effectively treated in adulthood?

The exact age for a given individual varies, depending upon type and severity; i.e., language problems that are quite intense can be identified as early as 18 months and motor coordination problems by age two. But higher order skill problems in reading, arithmetic, spelling and penmanship may be more difficult to ascertain before the age of five, but are reasonably reliably identified between the ages of five and seven years. In adulthood, it is possible to identify any of the developmental disorders and to verify their biological nature. Encouragingly, these developmental disorders, the majority of which seem to be treatable in childhood, remain treatable through the lifespan of the person unless there has been some unusual injury or illness that may have damaged the nervous system. Developmental disorders of reading, attention, math and nonverbal communication are all potentially treatable throughout the lifespan of the individual. Dosages and agents change with age, and the prognosis is best when the severity is mild and when the disorder is not multiple; i.e., not several different types of learning or attention problems.

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