Cohort Parameters
Story Presets:
2
Number of individuals who all reach age 100+ together.
82
Consecutive years of active bonded friendship.
18
Age when the friendship first formed.
0.03%
Benchmark 0.03% (~3 in 10,000 living Americans).
330,000,000
Census benchmark reference group.
Longevity Status:
Both friends must reach age 100 to sustain an 82-year bond started at age 18.
Demographic Longevity & Joint Survival Analysis
Washington Post BenchmarkEstimated Centenarians
99,000
Americans aged 100+
Joint Survival Prob.
9e-06
0.000009 joint rate
Cohort Rarity Score
Top 0.0009%
Demographic rarity percentile
Milestone Status
Over 8 Decades Verified
Reached age 100+ together
The Dorothy Boggess & Velma Long Case Study
When Dorothy and Velma formed their companionship in early adulthood, living past 100 was extraordinarily rare. Reaching 100 concurrently while preserving a continuous friendship of 80+ years combines micro-cohort survival probability with human relationship endurance, putting their bond in the top 0.0009% tier.
US Actuarial Survival Probability Curve & Century Cohort Gate
Target Age: 100 years
Single Centenarian Rate
1 in every ~3,333 Americans reaches 100 (0.03%). Survival requires genetics, lifestyle, and healthcare access spanning a century.
Co-Centenarian Friendship
For 2 unrelated friends, joint random likelihood is 1 in 11,111,111 (0.000009), demonstrating the near-miraculous nature of the Boggess-Long bond.