taru-adjective, adverb taking the 'to' particle
vigorous in old age; hale and hearty
Describes an elderly person who is remarkably energetic and healthy. Often used in the phrase 矍鑠たる or adverbially with と.
My grandfather is 90, but he is still hale and hearty and takes a walk every day.
The old professor stepped up to the podium with a vigorous gait.
Usually written in kana; the kanji form 矍鑠 is rare and may not be recognized by many readers.
Rare kanji form; the characters are complex and the spelling is seldom used in modern writing.
From Chinese 矍鑠, “vigorous or lively in old age,” famously used of the aged general 馬援 in the 後漢書.