Which parts of the Milky Way contain its youngest stars?

In the Milky Way Galaxy, the youngest stars are primarily located within the spiral arms. These regions are characterized by the presence of diffuse matter, gas, and dust, which serve as the raw material for ongoing star formation.123

Specifically, these young stars are often found in:

• Stellar associations: These are large, loose groupings of stars that have recently formed from the same interstellar cloud. They are most commonly found in the spiral arms and are considered the primary birthplaces of most stars.4
• Open clusters: These younger star clusters are also concentrated in the disk of the galaxy, particularly within the spiral arms, where they help define the galaxy's spiral structure.15

These objects are classified as part of the Population I stellar group, which is highly concentrated in the flat disk of the galaxy. Because these stars are of recent origin, they have not yet had time to move far from their common sites of formation, unlike older stars that are more widely distributed throughout the galaxy's halo or thick disk.642