I won't contend the point you're making regarding the costs of healthcare for population that is healthier on average vs one that isn't (elderly). That's true.

The idea that our collective human society is going to be handing out everlasting life to anyone who wants it is, even in light of this, something I can't begin to fathom. Perhaps if the arrival of the immortality drug also coincides with the arrival of a utopian society that actually cares about people beyond their basic (and incredibly power-imbalanced) economics that are skewed to benefit corporations not only over people, but over governments, then I can accept it.

But in context of the way the world currently works, this is an incredibly optimistic or naïve assertation to me. People die every day even in the most developed nations due to a lack of access to healthcare, food and/or shelter.