John 21:18

Thou girdest thyself (ezwnnue seauton). Imperfect active of customary action of zwnnuw, old verb, in N.T. only here and Acts 12:8 . So as to periepatei (walkedst) and hqele (wouldest), two other imperfects of customary action. When thou shalt be old (otan ghrash). Indefinite temporal clause with otan and the first aorist active subjunctive of ghraskw, old verb to grow old, in N.T. only here and Hebrews 8:13 , "whenever thou growest old."