The remaining members of the Donaldson family were each stripped of 10-20 years of their life...
Steve's final remnants of hair fell from his scalp as his pot-belly burst forth. His cheeks swelled up and sagged, and his chubby chin multiplied into a shivering mass. His already pale skin turned milky and veiny, his teeth yellowed (with a few falling out), and his entire body seemed to shrink and sag like a sack of potatoes.
Janet's ordeal was no better. Her pear-shaped body grew to resemble the fruit even more. Lumps of fat implanted themselves on her already plump rear-end, and her hair turned into a frizzled, straw-like mass of white. Wrinkles erupted like fault-lines from her eyes and mouth, along with a parade of age-spots that popped up on every bare inch of skin. She looked little different than the witch before the life-drain.
Alan faired much better than either of his now senior parents. His frame bulked out significantly, with a near-barrel chest and broad, sturdy shoulders. His legs and arms erupted with muscles, flexing and exploding through his former clothing. His face was now the chiselled visage of an all-star athlete. Looking like a greek god, he felt a little sheepish at his tattered clothing. His newly adultified sister Megan gave him a knowing look.
And of course, the witch came out on top. For every year of life she had taken from the family, her body had rejuvenated by that amount. She was actually a stunning woman, both in face and body. Her now perfectly smoothed features were etched like a statue, with charming dark eyes and blood-red lips. Her hair was a long cascade of shining black, her limbs were long and elegant, and her bust was barely concealed under her rags. She was now like a 'gothic' supermodel.
"Thank you, thank you all," the witch murmured with a seductive voice. "It's been a while since any fools have shown up around here, let alone any that were silly enough to enter my domain." She tossed her enchanted stick in the air, and caught it effortlessly. "Rarely do I have a chance to replenish my life force from so many."
"N-now... see here..." moaned Steve, trying to impose some threat with his now drained body. "Y-you've got.. to put us... back..."
"Do I?" cooed the witch, smiling at the family smugly. "Surely you would've wasted what little time you had left. I've merely spared you the sorrow of living it." She turned from the family, beginning to walk away. "Now, if you don't mind, I've got my new life to attend to. You may all leave now."
The newly aged family looks at each other, deciding what to do...