How can you want for other people what you don't want for yourself? Why should other people die, for example of cancer, when having the chance I'll opt for the cure?
I think early death is bad in the general case.
Life expectancy has changed a lot. In 1900 the life expectancy was around 40. A while before that it was 30. What will it be if we cure cancer, alzheimers, dementia, heart disease (the main killers of "old age")?
This sounds like you've just accepted that death is inevitable and you might as well not fight it, which is fair, but that's quite different from not wanting to live longer if the opportunity was available.