Final answer:
The last stage of the traditional family life cycle is known as the disengagement stage. It represents the later years of family life after children have grown and left home. However, newer models have emerged to address the shortcomings of traditional stage theories.
Step-by-step explanation:
The stage of family development considered to be the last stage of the life cycle is known as the disengagement stage. When we examine the traditional stage theories that detail the progression of a family through time, this stage typically involves older adults whose children have left home, leading to an "empty nest." At this last stage, family members often experience retirement, cope with health issues, and engage in social activities outside the family structure. This stage focuses on the adjustment to these later life changes and transitions.
While stage theories provide a way of categorically dividing the family life cycle into different segments, it's essential to acknowledge that these models have been criticized for not considering the vast diversity of family structures and the non-linear progression of many modern families. Consequently, newer models such as the family life course model have been introduced, which offer a more fluid understanding of family development that better accommodates the variability found within family life.