The graph shows the amount earned by graduates of different age groups in 2002. It includes those with a degree, those with a higher degree (postgraduate) and those with other qualifications. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The line graph illustrates the weekly earnings of full-time graduate employees in 2002 across different age groups. It compares three categories of qualifications: first degree, higher degree (postgraduate) and other qualifications. Overall, salaries for all groups tend to rise significantly during the early stages of their careers before stabilising or slightly declining in later years. […]