I agree that the term "forever home" is kind of silly. I do however think that it is used more colloquially than literally these days, to also mean, "plan on staying for a while" house. In my case I accidentally bought my forever home at 25. It was the low of the recession, plus I got 8000 from the government, and it's a house I couldn't afford today.
It also has sentimental value to me. My entire family, including my grandmother helped work on it. I have plants growing there, which were transplanted from my grandmothers yard. I have a tree growing there that was given to me under sentimental circumstances as well. Plus it's in a bomb location. Basically a little lush oasis in an urban area.
Regardless of if I live there or not (currently I am renting it out), I will never sell it. And even if I don't live there permanently in the future, it's in a tourist area so it would at least be a vacation house. I also believe deeply in roots, and though I do plan on living in other areas of the country, of the world, I like the idea of having something in my hometown to always go back to. So yes, you can make the commitment to own a property long term, in your 20s. One thing I didn't do was purchased the house based on the location of a job. Especially on an early retirement forum, I'm surprised that this is a consideration.
It just so happens by dumb luck, that I bought my house across the street from the type of place I would love to continue working at after retirement.