Unless we do something to reverse dna damage I don’t think that median quality life expectancy can be extended.

The variance in quality of life after your 60s is crazy high. There are many super healthy 60yo, there are also 60yo who are completely devastated from health problems.

And sure maybe you can drag it on for another 5-10 years if you have let’s say Alzheimer’s, but what is the point ?

A lot of longevity interventions (e.g. dietary antioxidants, sunscreen, reducing alcochol consumption) do slow DNA damage.

Getting people to take preventative measures is tough, but it's probably easier than reversing damage after it's done.