oいるiru
1.

To reach a stage in life where one experiences both the accumulation of wisdom and the onset of physical decline associated with advancing years.

2.

To undergo the natural process of aging, where one’s physical and mental vitality diminishes while knowledge and life experiences grow.

3.

To approach the later stages of life, where there may be an inevitable reduction in strength and vitality, reflecting the cycle of life.

Example:

かわいそうな事にその老いた女性はまたもバッグを盗まれた。

としお年老toshioいるiru
1.

To undergo the natural process of aging, resulting in increased years and often associated changes in appearance and vitality.

2.

To reach a more advanced stage in life, typically marked by the accumulation of experiences and wisdom.

Example:

誰も学べないほど年老いているということはない。