As we age, we often use descriptions that indicate we are "not young." There are several synonyms for this phrase that may be used to convey the same message with slightly different connotations. For example, someone who is "middle-aged" is likely over 40 but not yet elderly. "Mature" and "seasoned" are more positive descriptors that suggest wisdom and experience. Conversely, "old" implies a greater lack of youth and vigor. "Aged" or "elderly" indicate advanced years and are often considered more respectful. Ultimately, the synonym used depends on the context and the tone the speaker wishes to convey.