Human life stages — Chronological order Arrange the following human life stages in a meaningful chronological sequence: Puberty Adulthood Childhood Infancy Senescence (old age) Adolescence

Introduction / Context:
This item checks understanding of the natural progression of human development from birth to old age, including the physiological transition at puberty and the psychosocial phase of adolescence.

Given Data / Assumptions:

• Infancy precedes childhood.
• Puberty is the biological transition that typically occurs within early adolescence.
• Adulthood follows adolescence; senescence comes last.
• We use a broadly accepted educational-psychology ordering.

Concept / Approach:
Order by age progression while acknowledging that puberty is the biological onset that is commonly nested within the broader social-developmental period called adolescence. Some syllabi list puberty first to emphasize biology, then adolescence as the wider phase.

Step-by-Step Solution:
Birth to toddler period → Infancy (4).Early schooling years → Childhood (3).Physiological change → Puberty (1).Broader teen development → Adolescence (6).Full maturity → Adulthood (2).Late-life decline → Senescence (5).

Verification / Alternative check:
Many curricula accept either [Infancy → Childhood → Adolescence → Puberty → Adulthood] or [Infancy → Childhood → Puberty → Adolescence → Adulthood] depending on whether puberty is treated as trigger or sub-phase. The provided correct choice matches one widely used exam convention.

Why Other Options Are Wrong:
Any option that places adulthood before adolescence or senescence before adulthood conflicts with standard developmental ordering.

Common Pitfalls:
Assuming puberty and adolescence are identical; the former is a biological milestone, the latter a broader period of change.

Final Answer:
4, 3, 1, 6, 2, 5