Yes, it is common for both girls and boys to experience mood swings during adolescence, which typically occurs between the ages of 10 to 19 years old. During this period, there are significant hormonal and neurological changes happening in the brain, which can impact emotions and behavior.
At around 18-19 years old, many individuals are still in their late adolescence, and mood swings may continue to be experienced during this time. However, it's important to note that not everyone will have the same experience, and the intensity and frequency of mood swings can vary from person to person.
Factors such as genetics, environment, life events, and individual personality traits can also influence mood fluctuations. While mood swings are a natural part of growing up, if someone is consistently experiencing extreme mood swings that interfere with their daily life and well-being, it may be helpful to seek support from a mental health professional.