Ancient texts refer to the multiplicity of our existence as the chilicosm, a series or fractal of myriad worlds.
Ancient texts refer to the ages and epochs of our time as kalpas, a super long time period in which humans/animals/plants/earth continually grow and shrink in size (sages give no reasoning for the situation as far as I can tell; only that it is simply happening). [Refer to my paper called Why Did They Build Ancient Structures? and Pyramid Builders Are Still Here]
I wrote a paper called Signs of Our Planet and another paper called The Dynamic Experience of Time Dilation describing the relationship between gravitational time dilation, local oscillations of gravitational density and varying human and animal sizes. Given the nature of the fossil record, it becomes evident we are in the latter stage of the most recent kalpa, what ancient texts call "latter days" or "end times" (what the Aztecs refer to simply as the start of a new calendar, or the start of the next kalpa in the Vedic tradition).
In order to conceptualize the time period of kalpas. the ancient texts describe the kalpa length as the time it would take to erode a 3 mile thick rock by the brushing of a woman's dress once every three years. There have been many innumerable kalpas referred to in the ancient texts.
From my personal experience on the other side, I find the nature of what's being shared with our people by nonhuman entities always lacks big picture takeaways and a comprehensive knowledgebase, rather conveniently relying on the splendor and magic and mysticism of cyclic incarnation as it pertains to the finite human lifespan.