Centenarians of Mardia

It's quite truthful, it's basic math, using previous historical results to predict future performance.

Ie: if a train moves an approximate average of 5 miles a day for 30 consecutive days it and has 100 miles left to go at the end of that time, it can be inferred that in 20 more days it will arrive at it's destination.

Exact same concept with experience.

But as you level, don't you get stronger and gain more experience per day?