Metaphorical reference to an older person's skill, courage, or ability which remains as sharp as it was in their youth, often seen in the phrase 宝刀未老 bǎo​dāo​wèi​lǎo.

Negative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings

old; aged; (of people) venerable