How does the stellar population age of an Open Cluster contrast with a Globular Cluster?

Open Clusters are young populations (up to a few billion years), while Globular Clusters are ancient, often over 10 billion years old.

Open clusters are fundamentally defined as young stellar populations, meaning the stars within them formed relatively recently in cosmic terms, generally possessing ages no older than a few billion years. This contrasts sharply with globular clusters, which represent the galaxy's earliest formation phases, typically hosting stars that are over 10 billion years old. This difference in age is a primary distinguishing characteristic used by astronomers to categorize these two types of groupings. The youth of open clusters is further evidenced by the presence of massive, hot, blue O and B type stars that burn their fuel quickly, while the age of globular clusters reflects the universe's earliest stellar generations.