ageing

ikääntyminen, vanheneminen

ikääntyvä, vanheneva

kypsytys puhekieltä (present participle of)
puhekieltä The process of becoming older or more mature.
puhekieltä The deliberate act of making something (such as an antique) appear older than it is.
puhekieltä Becoming senescent; accumulating damage to macromolecules, cells, tissues and organs with the passage of time.
puhekieltä Becoming elderly.

The ageing artist could no longer steadily hold the brush.