From which age does adolescence generally begin?

Adolescence generally begins around the age of 12 years, which aligns with the onset of puberty for most individuals. This period marks significant physical, emotional, and cognitive changes, as children transition from childhood into their teenage years.

During this time, individuals experience growth spurts, development of secondary sexual characteristics, and shifts in social relationships as they move towards greater independence. The age of 12 is also reflective of important developmental milestones, making it a widely accepted starting point for adolescence across various frameworks in psychology and education.

The other ages listed, such as 6 years, 19 years, and 3 years, do not typically correspond with the onset of adolescence. Six years is still considered early childhood, while 19 years usually signifies the end of adolescence rather than the beginning. Similarly, three years of age falls into the toddler stage, far from the teenage transition.