2QUESTION 2 OF 3
Answer & explanation
The official answer, with Fermi’s reasoning step by step.
Answer & explanation
Official answer
194
years
How to estimate it
Fermi’s official “Napkin math”
Jonathan is obviously much older than the oldest human, but beyond that it's a guess. If the oldest human is 110~ and Jonathan is 50% older, he'd be 165.
- Oldest human
- ~110 yrs
- 50% older
- × 1.5
- 110 × 1.5
- ≈ 165 yrs
Rounded assumptions may give a slightly different estimate. The official answer above is the game’s reference value.
Source calculation & reference
- Arrived on St Helena in 1882, already fully grown
- at least 50
- Estimated hatching year (official birthday Dec 4)
- 1832
- 2026 - 1832
- = 194
Reference cited by Fermi: Guinness World Records
How close was your guess?
Your comparison will appear here.
Compare by ratio: divide the larger number by the smaller one. The closer to 1×, the better.