Age
Older/younger; age differences and birth-year order.
Age
Age Order Problems
What you'll learn
- Order people by older/younger clues.
- Compute age differences from birth order.
- Link age to birth year (older person → earlier birth year).
- Combine age with ranking in word problems.
Key concepts
Level 1 — Older vs younger
If A is older than B → A's age > B's age.
Level 2 — Age difference
A is 3 years older than B → A = B + 3.
Level 3 — Birth year
Born in 2015 is younger than born in 2013 (same month assumed).
Level 4 — Indian context
Three siblings in Kolkata: elder brother helps younger sister with homework — use age order from clues.
NCERT anchor: CBSE Class 4 logical reasoning — older/younger and age differences
Worked example
Ravi is 2 years older than Sita. Sita is 10. How old is Ravi?
Step 1 — Ravi = Sita + 2.
Step 2 — 10 + 2 = 12.
Answer: **12 years**
A is older than B. B is older than C. Who is youngest?
Step 1 — A > B > C in age.
Answer: **C is youngest**
Common mistakes
| Mistake | Why it happens | Fix |
|---|---|---|
| Older means smaller age number | Confusing bigger with older | Older → larger age number |
| Birth year 2016 > 2014 means older | Reversing year rule | 2014 birth → older than 2016 |
| Adding when subtracting age diff | Operation error | Older by 3 → add 3 to younger's age |
| Mixing height and age clues | Wrong attribute | Separate age clues from height |
Quick check
- A is 5 years older than B. B is 8. A's age?
- Oldest of three from A>B, B>C?
- 2012 birth vs 2015 — who is older?
- Stretch: Grandfather is 55 years older than grandson. Grandson is 8. Grandfather's age?
Revision tip: Write ages on a number line — further right = older (larger age).
Open the Practice tab for graded questions on Age Order Problems.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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