Advanced age; being elderly. Refers to being of an older age, often used in medical or social contexts.
高齢の両親の世話をするのは大変だ。
Caring for elderly parents is difficult.
日本は世界で最も高齢化が進んでいる国の一つだ。
Japan is one of the countries with the most advanced aging population in the world.
高齢でも元気に暮らしている人が増えている。
The number of people living actively in old age is increasing.