According to Particle Data Group:
source: data
Particles and their antiparticles (i.e. antimatter) have the same lifespan.
The electron/positron for example have a minimum of 6.6E28 yr. This was experimentally verified for the electron here in this 2015 paper: paper (see also here in this story cover article IOP)
Nevertheless, there is no any experimental verification of why stable antiparticles like the positron should have the same lifespan with their normal particles counterparts (e.g. electron)?
Seems to me that this is more like a theoretical ansatz.
Is there any experimental verification ever for the above?
This might be crucial information. Maybe besides charge and chirality there is something else going on concerning the interaction of stable antiparticles with vacuum space that could explain why matter is dominant in our Universe and not annihilated with the production of equal amount of matter and antimatter during the Big Bang?