Who wouldn't want to reverse aging and almost fix most of the disease and costs associated with it on their population. Who, on individual level, wouldn't want to look 20 again.
Right now, the problem seems to be that we, in general, we do not believe that such thing is possible.
This will change as soon as we have a robust rejuvenation event at least in mice. After that, the rejuvenation is going to be the new field where all the investors money will go.
On a more modest perspective, stuff related to health and longevity will also see growth. New sensors, new ways to gradually improve health using tech.