The characters literally combine to mean “Years are abundant, strength is powerful.” This elegantly captures the idea of being young (having many years left) and at the peak of one's physical and mental prowess.
年富力强 reflects a deep-seated cultural appreciation for the period in life when an individual can contribute most to their family, company, or society. This stage, typically seen as early adulthood to middle age (roughly 20s to late 40s), is considered a golden window of opportunity. A useful comparison in Western culture is the phrase “in one's prime.” However, 年富力强 carries a stronger connotation of societal expectation and potential for contribution. While “in one's prime” can simply be a statement of fact about one's physical condition (e.g., an athlete), 年富力强 is almost always used to describe someone in a context of responsibility, career, or leadership. It implies a readiness to take on challenges and lead projects. It is less about the personal enjoyment of youth and more about the capacity and duty that come with it. This ties into the broader cultural value of striving, seizing the moment, and using one's peak abilities for a greater purpose.
This is a formal and laudatory term. You won't hear it used casually between friends over coffee. Its usage is primarily reserved for more formal or written situations.
Its connotation is overwhelmingly positive and respectful.