Which disease is associated with minor tremors in one or more limbs, abnormally high levels of glutamate in the cerebrospinal fluid, and onset between ages of 40 and 60

The disease is amyotrophic lateral sclerosis

Explanation:

Amyotrophic lateral sclerosis or ALS, is a disease that causes loss of muscle control. It first affects spinal cord and brain nerves thereby causing loss of muscle control.

It spreads to other parts of the body after affecting the hands, limbs or feet.

Till date the main cause of ALS is unknown although it is hereditary.

Some symptoms of ALS involve:

Weakness in legs

Hand weakness

Difficulty in walking

Difficulty in swallowing

Slurred speech

Muscle cramps