What is is 30 young?

The phrase "30 is young" suggests that someone who is 30 years old is still considered to be relatively young in the grand scheme of life. At age 30, many people are still early in their careers, may not yet have children, and could still be exploring different paths and opportunities. While 30 may not be as young as one's early 20s, it is still considered to be a time of youth, growth, and potential. This belief is subjective and can vary depending on individual perspectives and circumstances.