system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Both Anakin and Luke Skywalker were initially told that they were too old to begin Jedi Training. Why is Jedi training traditionally supposed to begin at such an early age?
gpt
When they've grown up, they're more likely to have preconceived ideas of what is and isn't possible. Remember all of the times Luke said something couldn't be done before being proven wrong? Until Yoda pulled the X-Wing out of the swamp, that attitude would have crippled his Jedi training.

The Force won't work if you don't think it will, because you'll will it *not* to work subconsciously. When you start as a toddler, you won't have any ideas like "No one can move that fast" or "No one could lift that". Because the children don't know what is and isn't really possible, the Jedi can teach them their true limits, rather than what the outside world thinks their limits are.