also: ざかり
peak; height; full bloom; in full swing
Describes the most intense or active period of a season, event, or natural phenomenon. Often used as a suffix with the voiced form ざかり.
The cherry blossoms are at their peak now.
At the height of summer, this area gets crowded with tourists.
The party was past its peak.
prime of life; best days; bloom of youth
Refers to the peak period of a person's life, career, or vitality. Also used as a suffix with ざかり, e.g. 働きざかり (prime working age).
He is in the prime of his life now.
I have three children who are at their hungriest growing stage.
Specifically for animals in mating season. Not used for humans.
Cats often come into heat in spring and autumn.
The cherry blossoms have already passed their peak.
The autumn leaves are now at their peak.
The cicadas are chirping at the height of the season.
prime of one's working life; peak working years
growth period; growing stage