So I saw this article and realized this technique could solve the problem of accumulated mitochondrial damage.
Instead of going through the hassle of figuring out allotropic expression or manipulating our bodies' mitochondrial quality control process, we could simply inject well-functioning mitochondria directly.
The technique seems relatively simple. Here's some relevant texts on mitochondria transplanting:
Mitochondrial transplantation for therapeutic use
Quality Control Parameters for Mitochondria Transplant in Cardiac Tissue
Edited by Acetylnordopatoninol, 15 September 2018 - 08:00 PM.