Epigenetic inheritance is a mechanism whereby traits could be passed from one generation to the next without modifying the underlying genetic DNA. The mechanism would alter the expression of different parts of DNA.

It’s a very young field with a lot of open questions. The concept has been adopted and abused in the mainstream so you have to be careful to separate the science from the pseudoscience.

> It’s a very young field

https://en.wikipedia.org/wiki/Epigenetics#Definitions

That depends on the definition. But, if we use the modern definition, it emerged (or re-emerged) in the 1990s. It's not old, indeed, but I also would no longer call it "very young". It's soon 40 years in the modern definition, and much older if we include prior discussions.