Population activity

I found the site interesting and from a math standpoint, some of it is useful since typically, population growth resembles exponential growth. In my biology days, population studies were interesting because of how carrying capacity of a biome is raised and how it governs the population. From a social standpoint, the graying of countries causes many concerns and a lessening of the general population, ie. China, etc, is not always a good thing particularly for the elderly as they may seem to be in the way. (After all pensions are expensive, especially if they live a long time.) Since I am nearing the retirement age, this does concern me. So from a math standpoint, it is interesting to start looking at how a demographic similar to Europe strains the workforce and effects ecomonies. So using the website and activity, tailored to suit my needs will lead to many math applications. I must comment though, that my wife and I have three children, two daughters (married now) and a son and I never think about how much money they were to raise, rather, I think about the emptiness I would have have not knowing them.