is as old as
Un hombre es tan viejo como se siente, y una mujer es tan vieja como aparenta.
A man is as old as he feels, and a woman is as old as she looks.
Nadie es tan viejo como para no pensar que puede vivir un año.
Nobody is so old that they don't think they can live another year.
Él es tan viejo como mi padre.
He is as old as my father.
Mi padre no es tan viejo como parece.
My father is not as old as he looks.
Él no es tan viejo como parece.
He's not as old as he looks.