Having the foresight and persistence to see this through is another matter all together.

I wonder how many "kids2 listen to this kind of thing. For those that do, they will likely be in a very good position come their mid-life crisis and perhaps, avert a crisis altogether.

but with changes in life, especially with a family, are we willing to give that time we have with our daughters?

This is why it is more a young man's (or old man's) game. There is a window where some things are possible, but at some point, it is no longer practical. There are always options however. My friend for example wouldn't actually need to stack shelves, he would be able to teach a few side classes (in his background) as a sole proprietor. He used to do this as a main job, like I did. I kept it going though, he didn't. It opens up other opportunities too.

Also, I wonder if something like shelf stacking would be a good way to get some mental rest from other things, whilst still adding value. Mindless work, interacting with a different set of people.