Age: 0–1 year
Meaning:
A baby who is still highly dependent
Cannot walk or speak properly
Rapid physical and neurological development
Notes:
Medical term
Very strictly defined
Sometimes subdivided into:
Newborn: 0–28 days
Infant: 1–12 months
Age: 1–3 years
Meaning:
Learning to walk (“toddle”)
Developing speech
Strong curiosity, low impulse control
This term is widely used in parenting and child psychology.
Age: 3–12 years
Meaning:
Primary school age
Cognitive skills developing
Emotionally dependent
Identity not yet formed
Sub-groups sometimes used:
Early childhood: 3–6
Middle childhood: 7–12
Age: 13–19 years
Why “teenager”?
Because the numbers end in teen:
Thirteen → Nineteen
Meaning:
Puberty
Emotional intensity
Identity exploration
Brain still developing (especially decision-making)
Important scientific note:
The brain (prefrontal cortex) is not fully mature until ~25.
So teenagers may look adult but often don’t think like adults yet.
Age: 18–25 (sometimes up to 30)
Meaning:
Legally an adult
Still emotionally and neurologically developing
Exploring career, relationships, independence
This term is very common in:
Psychology
Sociology
Marketing
Education
How and where to use the word:
1. Crime and Law (Very common in IELTS Writing Task 2)
This is the most frequent and natural context.
• “The number of juveniles involved in criminal activities has increased in recent years.”
• “Governments should focus on rehabilitating juveniles rather than punishing them severely.”
• “Juvenile delinquency is often linked to poor parenting and lack of education.”
👉 Here, “juveniles” sounds more formal and precise than saying “young people” or “teenagers.”
2. Education and Development
You can use it when discussing behavior, learning, or growth.
• “Juveniles require proper guidance to develop into responsible adults.”
• “Many juveniles struggle with academic pressure and social expectations.”
• “Extracurricular activities play a crucial role in shaping juveniles’ personalities.”
3. Social Issues
Useful when writing about societal challenges affecting young people.
• “Social media has a significant impact on juveniles’ mental health.”
• “Many juveniles are exposed to violence through digital platforms.”
• “Providing safe environments for juveniles should be a priority for communities.”
4. Negative Behavior / Discipline
Often used when discussing immaturity or irresponsible actions.
• “Some juveniles engage in risky behavior due to peer pressure.”
• “Juveniles may lack the maturity to make informed decisions.”
5. Important Tip
Although “juveniles” is a strong vocabulary word, don’t overuse it.
• It can sound too formal or slightly negative in some contexts.
• In Speaking, it may feel unnatural—use “young people,” “teenagers,” or “children” instead.
• Best suited for Writing Task 2 essays, especially on crime, education, or society.
Age: 25–60 (roughly)
Meaning:
Fully developed brain
Independent decision-making
Social responsibility
Stable identity (usually)
Legal definition:
Adult = 18+
Developmental definition:
Adult thinking = 25+
That’s why there’s confusion.
Age: 40–60
Meaning:
Peak responsibility
Career maturity
Family responsibilities
Long-term planning
Not a medical term — social one.
Age: 60+ (sometimes 65+)
Meaning:
Retirement phase
Aging body
Experience and wisdom
Health becomes a priority
“Senior citizen” is an administrative term, not biological.
✔ “Youngster”
This is not a scientific term.
Usually means:
Teenager OR young adult
Roughly 13–30, depending on context
People often say:
“Youngsters these days…” → teens/early 20s
“He’s a youngster” → 18–25
So it’s context-based, not precise.
✔ “Youth”
Often means:
15–29 (UN definition)
Used in policy, education, sociology