A Separation anxiety disorder is a condition that can be diagnosed at any age.
This kind of anxiety can have an onset in childhood or adulthood which affect the quality of life of their lives although the condition can be managed with treatment.
Hence, the Separation anxiety disorder is a condition that can be diagnosed at any age.
Therefore, the Option A is correct.
Read more about Separation anxiety
brainly.com/question/9715641
#SPJ1