Most stars do not form in isolation, but are in clusters ranging from dozens to thousands of stars.
Even in our galaxy, the Milky Way, with stars more than 13 billion years old, has a lot of young, hot action: new objects form and others are destroyed. NGC 2547 is an example.
How young is young, cosmically? Considering that our Sun is 4.6 billion years old and has not yet reached middle age, NGC 2547's stars ranging from 20 to 35 million years old is really young. If you imagine that our Sun as a 40 year-old person, the bright stars in the picture below are three-month-old babies.