And another thing --

In The Half-Blood Prince, Chapter 27, The Lightning Struck Tower, page 594:

“He's not long for this world anyway, if you ask me!” said the lopsided man,
to the accompaniment of his sister's wheezing giggles.
“Look at him – what happened to you then, Dumby?”

“Oh, weaker resistance, slower reflexes, Amycus,” said Dumbledore.
“Old age, in short... One day, perhaps, it will happen to you... if you are lucky...”

“What's that mean, then, what's that mean?” yelled the Death Eater...

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What DOES that mean?
Did the potion really do all that, or was it something more?