The most obvious age for separation anxiety is during the early childhood period, when children are between the ages of 1 and 3 years old. Children spend more time with their parents at this age, and their brains are maturing, so they may experience significant anxiety after being separated from their father or mother. This is especially true in the early years of kindergarten, when children have been with their parents for a long time and suddenly become insecure and nervous after being separated. This situation will ease as children gradually adapt to kindergarten life, and parents should be careful to control their own emotions, as most children can overcome separation anxiety.