In the wake of Force Awakens, we’re still arguing that a Jedi needs extensive training? 😉
This crawl is well-written, but it begs the question of him leaving then going back and being surprised that Yoda is dying if he had JUST seen him a week before.
I guess the only way is during that time he was away (from days to weeks depending on travel time, etc) then Yoda got sick (which he admits, as well as being old) and Luke, like any of us, says reassuring things … granted it was about age.
Though when an older person gets sick, deepening what it is, it can be a relatively quick death …