老衰するな！老成せよ！

老衰するな！老成せよ！

Don't grow old, grow wise!

老衰(ろうすい)するな！老成(ろうせい)せよ！

Rōsuisuru na! rōseiseyo!

老衰 (ろうすい)

senility; senile decay; infirmity (through age)

な (な)

(sentence end, mainly masc.) indicates emotion or emphasis; (used with masu stem verb) command; (used with dictionary form verb) prohibition

老成 (ろうせい)

mature; becoming precocious

Readings: ロウ、お.いる、ふ.ける

Meanings: old man, old age, grow old

Readings: スイ、おとろ.える

Meanings: decline, wane, weaken

Readings: セイ、ジョウ、な.る、な.す、 -な.す

Meanings: turn into, become, get, grow, elapse, reach