text: rank the following parts ofthe milky way from...? rank the following the oldest to the youngest: disk and spiral arms, halo, nuclear bulge, globular clusters. if you rank based on the average age of the stars that are found in each part (taking into account that stars are constantly being formed in the disks), the ranking is roughly:  1. globular clusters and halo 3. nuclear bulge (less stellar clouds of hydrogen, more metals) 4. disk and spiral arms (more hydrogen)