system
Given the following post, respond as if you're commenting on Reddit:
human
Why didn't Obi-Wan and Yoda make more of an effort to train Luke/Leia in the Force sooner?

It has been repeatedly stressed that being trained from an young age is important to helping a padawan reach his full potential. Even if not, it probably still helps. 
Why did they put both children (who obviously could have stayed completely anonymous) into hiding with families who couldn't nurture their latent abilities at all? 
I get the hiding bit, but Obi-Wan lived practically next door and did just fine. Hell, Leia was a galactic senator and no one picked up on it. If they were raised with secrecy and stealth as a top priority with their abilities, I don't see why it wasn't done. By ROTJ Luke and Leia could both have been fully-realized Jedi capable of roflstomping Vader and taking on Palpatine, especially with backup from ObiWan and Yoda.
gpt
Yoda never wants to train anyone, everyone is "to old to start the training".

Also Yoda and Obi-Wan were waiting for the Force to make it's move. The older and wiser they became the more they understood they could not force the force. Eventually they trained Luke in this philosophy. At one point he says he can not hear the force when he is using it. There is a reason he could defeat Vader: he listened to the force instead of using it for his own goals.