I think as a technology it is certainly part of the future, however as for the location of Ukraine and unproven claims of treatments that cost lots of money, especially when many of the both more advanced and cheaper countries like Korea, Israel haven't managed to pull it off. My scepticism of any stem cell therapy being practicably useful is pretty high at this point in time.
As for anti aging there are so many other alternatives to consider from something as simple as exercise, c60, that new david sinclair study, to hormone replacement to blood transitions like (epo), NSI, Dihexa.
If we are talking about serious mental decline the problem is cascading, as I understand it the problem with curren stem cells is more to do being unable to establish a specialised role in a complex ecosystem like the brain or a organ, which is why tissue replacement is the only thing that works at the moment, and the tissue replacement needs to be very specific being incorporated in a scaffolding which emulates that ecosystem.
Of course the body is also very good at just fixing things itself, but that doesn't quite answer the question why stem cells can't just be injected into missing tissue, and the body immedietely adapts it into that type of system, my guess is that incorporating random stem cells doesn't install the programming required for the body to make those stem cells change into what is necessary and go in the right place.
Kind of like when a baby grows from a few cells into organs, it follows a route of cascades which programs what the stem cells transform into ultimately e.g. heart tissue. As there is no natural programming against the deterioration of diseases like alzheimers, the body would have little "execution protocol" for extra unspecialised cells, at best it will turn into more purposeless tissue, at worst the stem tissue could just become cancerous.
^ As I think of it, for example the body is only programmed to grow your heart once, your brain once, your legs once etc, if you just shove it a bunch of stem cells, doesn't it make sense that there is no electronic protocol to put those cells into the eco system or upgrade it?
For simple tissue replacement its already been tried and tested, they printed an entire trachea, they are working to print organs, but of course for people at the end of the line and rich as bill gates, injecting a bunch of stem cells randomly, maybe it will work why the hell not lol.