A longitudinal study on stress levels from 1983 to 2009 revealed the following trends for different age groups: individuals aged 45–54 experienced a continuous rise in stress; those aged 55–64 showed a steady, gradual increase; and adults aged 65 and older consistently reported the lowest stress levels, with a decrease from 1983 to 2006 followed by a minor increase in 2009. Which of the following statements provides the most accurate analysis of these findings?

A series of national surveys from 1983 to 2009 revealed distinct patterns in reported stress levels across different age groups. Key findings include: 1) Individuals aged 45–54 experienced a continuous rise in stress. 2) The 55–64 age group showed a steady, gradual increase. 3) Younger adults (under 45) saw their stress peak in 2006 before declining. 4) Those aged 65 and older consistently reported the lowest stress levels, with a general decrease over the period. Based on these findings, which statement best analyzes the relationship between age and stress trends during this time?