> This is about those aged over 100, not 110 which is a completely different ballpark

Is this some kind of new math? 100 and 110 are within 10% of each other, which seems very much in the same ballpark to me.

They are not within 10% of each other when you consider human mortality rates.

Ie if you live to 100, you do not have 10% chance of living to 110.

Eg this study says:

"Three percent of females and 1% of males in the 2019 birth cohort, given age-specific mortality rates in that year, are projected to survive to 100 years old. Only 0.4% of females and 0.09% of males will survive to 105 years which is 10 times rarer than survival to 100. Survival to 110 years is 150 times rarer for females and 333 times rarer for males (0.02% for females, 0.003% for males) than living to 100. "

https://www.bumc.bu.edu/centenarian/statistics/

Your chance of dying is roughly 50% per year in that range.

2^10 = three orders of magnitude difference in survival

The chance of dying is not linear with age.