Final answer:
A recently established community might attract older individuals above the age of 55 due to favorable conditions for retirement, which can lead to a population structure skewed towards this older age group.
Step-by-step explanation:
An economic reason why a recently established community might have a population structure with a higher proportion of people over the age of 55 could be related to economic development and retirement migration. In some cases, older individuals may move to newly developed areas that offer better living conditions, amenities tailored to retirees, or a lower cost of living. This can result in a population structure that is weighted towards an older demographic, contrasting with regions experiencing rapid growth, which typically show a larger base of younger individuals due to higher birth rates.