健在

1. Origins, structure, and basic meaning

• Structure: 健在 is read as けんざい and is a na-adjective for continued vigor or a technique or tradition still thriving.
• Basic usage: A person still being active appears in 今も健在だ, while a technique thriving among young artisans appears in 若い職人の間でも健在だ.

2. Common pitfalls and similar expressions

• People and nonhuman subjects
  • It applies to a person’s health and to the continued life of a nonhuman subject.
• Difference from 元気
  • 健在 emphasizes continued activity or survival over time rather than present energy.