The English language provides a plethora of synonyms for the phrase "become old". Some of the most common include "age", "mature", and "senesce". Other synonyms such as "decline", "deteriorate", and "weaken" infer a negative connotation. Alternatively, "ripen", "develop", and "season" may suggest a more gradual and natural transformation. "Emerge", "unfold", and "evolve" also provide a broader scope of meaning and may be used to describe changes in character or personality. Ultimately, the term used to describe the process of aging is subjective and dependent on context.