Dr. David Sinclair's lab has shown that they can now reverse the aging process.

“Research from Dr. Sinclair's lab at Harvard, published in journals like Cell and Nature, has demonstrated age reversal in specific contexts. A January 2023 Cell paper showed they could reverse aging and restore vision in mice by resetting the epigenome. Subsequent research presented in April 2023 showed this gene therapy approach also restored visual function in non-human primates. While this is a major advance, it has so far been demonstrated in specific tissues (like the optic nerve) in animal models, not as a whole-body reversal in humans. Context: The claim is based on successful experiments in animal models, specifically restoring vision in mice and monkeys by reprogramming cells to a more youthful state. Human trials, co-founded by Sinclair's company Life Biosciences, are planned but have not yet been completed.”