Ironically, anti-aging treatment would likely make people less grumpy and reduce load on healthcare. Doesn’t address the wealth inequality issue though, which is suspect is your main gripe.
Anti-aging treatment would be healthcare, and except in the short-term would increase the load on the rest of healthcare outside of its own costs.
Age is different. Look at health expenses per decade - the difference is like night and day. Most people in their 20s and 30s don't even visit a hospital. The healthcare expense for most of them can simply be rounded to zero. Some time in the 60s things change dramatically (health degradation is supralinear with age). So if you manage to push back the health of seniors to, for example, their 50s, you pretty much solve healthcare permanently.