Final answer:
The problem appears to be a mathematical calculation related to population estimation, but without sufficient data provided, it's not possible to accurately calculate the population of Cerdanyola for the epoch in question.
Step-by-step explanation:
The question provided does not contain enough specific information to accurately determine the population of Cerdanyola during a particular epoch. However, it seems to be a mathematical problem related to population estimation using provided demographic data such as age distribution and birth rates. Typically, these kinds of problems require data on the initial population, growth rates, immigration, and mortality to make reliable estimates. The references to historical population figures, life expectancy, and age distribution suggest that we are looking at a theoretical or historical population study scenario that is generally covered in social studies or history classes, but the method of arriving at an answer would utilize mathematical calculations like proportions and percentages.
The provided information, while it leads to inferences about demography, does not directly lead to a calculation for the population of Cerdanyola at a specific time without additional context or data.