Your body doesn't know how old it is. It knows nothing of calendars. Aging is not an inescapable process. It's actually a material view of life laced with an accumulation of worry, apathy, selfishness, or other negative attitudes. We all know of people who think like old fuddy-duddies at twenty-five, and we also know brilliant, active, growing individuals in their nineties.
There is no real reason for us to be less vital at ninety than at nineteen. In the degree we accept the material world's belief in inescapable decline, we will probably experience it; but rejecting the notion that decline is inevitable and understanding why this belief is false, bring into our lives practical results such as vigor and vitality.
Being is ageless because it is an impartation of God, the unending divine good who gives only of His own nature— ageless in beauty, in peace, and joy. Where else could immortal life come from? Christ Jesus, who taught the clearest idea of God and who embodied His man, said, "I am come that they might have life, and that they might have it more abundantly." John 10:10. There was never a hint of impending or inevitable decline in his teachings or in his wonderful works.