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human
[Star Wars] Why didn't Obi-Wan and Yoda just raise Luke and Leia themselves?

One of Yoda's complaints about training Luke is that he's too old to begin it, and it's established that Jedi begin their training when they're toddlers. Obi-Wan and Yoda were both there when Luke and Leia were babies, so why not take them to Dagobah and raise them to kill Vader and Palpatine themselves? If it was so necessary to separate them, you could have Obi-Wan raise Luke and Yoda raise Leia or visa-versa. So why did they wait until the kids were in their late teens to begin training them?
gpt
Raise them on Dagobah? A swamp world filled with monsters that would look at a growing kid like he's a Endorian Chicken McNugget? Yoda could easily protect the twins but the reason he went to Dagobah is because he needed to cloak his presence from Vader and the Empire. Force users can sense other Force users and Yoda is so powerful and so unique (as far as other Force users go) that he would be like a bright blinking beacon to anyone looking for him. So he parked himself next to the Cave on Dagobah, an incredibly powerful source of dark side energy, effectively drowning his presence out. It wouldn't be good if he had to use the Force to rescue the kids from some monster once a week. He's a powerful Jedi Master with centuries of experience and can probably hold that influence at bay while using it to cloak himself - how would an untrained Force sensitive child like Luke or Leia fare? 

Obi-wan isn't as powerful as Yoda, but with the purge of Jedi, he would stand out all the more. That's why, during his hermitage on Tatooine, he spent much of his time in meditation to cloak himself. He still managed to look in on Luke from time to time, but he wouldn't be able to actually *raise* Luke because of that. 

Also, look at the logistics: Dagobah is a swamp planet. What happens when one of the kids, with their less-robust immune systems, contracts space malaria? How does Yoda, in a mud hut with no access to Bacta, treat that? How does he take him into space to get treatment? How does he keep his presence hidden? Stick them on Tatooine with Obi-Wan then. But he's meditating much of his time and so he can't raise them. Stick them both with Aunt Beru and Uncle Owen then, but what happens if their farm gets raided by some Sandpeople or attacked by a Krayt dragon or taken by some Imperials? Your eggs are all in one basket and the heroes you're counting on are dead or sold into slavery to some Hutt.

Okay then, stick them underground somewhere and watch over them and provide them food and water and such. Then you end up with socially-stunted agoraphobes, not the next generation of galactic leaders meant to guide the galaxy out of the shadow of the Empire, rebuild the Republic, and return the Jedi Order to glory. Separating them and placing them where they did (Luke with the good, salt-of-the-earth Beru and Owen and Leia with the politically apt Alderaanian royal family) ensured that they got the training and moral groundwork they needed. Jedi training can come later.