noun, noun which may take the genitive case particle 'no'
young and hot-blooded; impetuous youth
Describes the passionate, impulsive nature of young people. Often used in literary or formal contexts.
The young and hot-blooded youths took on a new venture.
His impetuous, youthful behavior surprised those around him.
血気盛ん also means 'hot-blooded' or 'full of vigor,' but it is a more common and less literary expression than 少壮血気.
若気の至り refers to the follies or mistakes of youth, emphasizing the excusable nature of youthful indiscretions, whereas 少壮血気 focuses on the passionate, impulsive energy itself.
A four-character compound (yojijukugo) combining 少壮 (young and vigorous) and 血気 (blood and spirit, i.e., hot-bloodedness). The exact historical origin is uncertain, but it follows a common pattern of pairing related concepts to create a literary expression.