Maybe some people do it in a different pace, but everybody is able to learn. What matters is the mindset:
Just because you believe people are not able to learn, for whatever reason you have, that doesn’t mean it’s true.
The world is the same for everybody, what matters is how you see it.
If you see it with a growth mindset, you will understand that any ability or intelligence is just a matter of deliberate practice and learning.
Anybody can do it, it just takes time.