Disclaimer: I'm not a biologist and this post is a result of amateur armchair research (I did some quick searches on the web).
The body uses stem cells to build, repair and maintain organs. On a biological level, stem cells therefore are a viable means of aging reversal.
"Stem cells are undifferentiated biological cells that can differentiate into specialized cells and can divide (through mitosis) to produce more stem cells. " -- https://en.wikipedia.org/wiki/Stem_cell
Those stem cells that are called "completely pluripotent" can turn into cells of all types of organs.
"In cell biology, pluripotency (from the Latin plurimus, meaning very many, and potens, meaning having power) refers to a stem cell that has the potential to differentiate into any of the three germ layers: endoderm (interior stomach lining, gastrointestinal tract, the lungs), mesoderm (muscle, bone, blood, urogenital), or ectoderm (epidermal tissues and nervous system). However, cell pluripotency is a continuum, ranging from the completely pluripotent cell that can form every cell of the embryo proper, e.g., embryonic stem cells and iPSCs (see below), to the incompletely or partially pluripotent cell that can form cells of all three germ layers but that may not exhibit all the characteristics of completely pluripotent cells." -- https://en.wikipedia.org/wiki/Cell_potency#Pluripotency
One interesting recent result from mainstream science is the discovery of induced pluripotent stem cells (iPSCs):
"Induced pluripotent stem cells (also known as iPS cells or iPSCs) are a type of pluripotent stem cell that can be generated directly from adult cells. The iPSC technology was pioneered by Shinya Yamanaka’s lab in Kyoto, Japan, who showed in 2006 that the introduction of four specific genes encoding transcription factors could convert adult cells into pluripotent stem cells. He was awarded the 2012 Nobel Prize along with Sir John Gurdon "for the discovery that mature cells can be reprogrammed to become pluripotent." 
Pluripotent stem cells hold great promise in the field of regenerative medicine. Because they can propagate indefinitely, as well as give rise to every other cell type in the body (such as neurons, heart, pancreatic, and liver cells), they represent a single source of cells that could be used to replace those lost to damage or disease." -- https://en.wikipedia.org/wiki/Induced_p ... _stem_cell
Here is a short video explaining induced pluripotent stem cells:https://www.youtube.com/watch?v=oQKL5N1UwpE
And in this short video it's explained how the genes for pluripotent stem cells remain in ordinary cells and are simply switched off:https://www.youtube.com/watch?v=i-QSurQWZo0
Switching genes on and off is something Bruce Lipton has talked extensively about and this is the role of epigenetics which means control above the genes. And in this video he explains how our beliefs can change which genes are on or off:https://www.youtube.com/watch?v=BjjvimJRevQ
This means that by using our minds we can reprogram the epigenetics of our cells, and depending on the intelligence of the body this includes the switching on of those genes that are needed to turn ordinary cells into induced pluripotent stem cells. Given the fact of the amazing capacity of the placebo effect and things like spontaneous remission, it should be possible for the mind to produce new stem cells through change of mental beliefs. Although remember that 'belief' here includes the deep subconscious mental patterns which also need to change. Subconscious activities are below our direct conscious awareness, yet they can still become conscious through mindfulness of emotions and other sensations in body and mind.