Anti-aging science is not just about living more years, it's about being able to live healthy and fulfilling lives both physically and mentally even as you age. Way too many people are broken by age before they die, to prevent that would be fantastic.
Thats's 2/3rds of the picture. The other 1/3rd of "anti-aging" is selling snake-oil fads to suckers and for people with anxieties to obsess over.
One man's lack of anxiety is another man's Stockholm syndrome. That in this day and age, anti-aging research is still considered fringe and frowned upon by the overarching culture, instead of being one of the top priorities of R&D worldwide, is pretty damn shameful.
Well, people have escaped kidnappers. None has escaped death, and until this happens (which very well could happen technically at some point) it's just anxiety over the inevitable.
Why not want to extend it rather than make up reasons for old people to die that aren't killing them?