HOw do you say...
How do you say too old or too young for something in terms of age? For example 'I am too old to dream'
And complex sentence structure such as 'I realized how hard it is to become a good teacher', etc.

Thanks!

Question

HOw do you say...
How do you say too old or too young for something in terms of age? For example  'I am too old to dream' 
And complex sentence structure such as 'I realized how hard it is to become a good teacher', etc.

Thanks!

Answer

I am too old to dream = 나는 꿈을 꾸기엔 너무 늙었다/ 나는 꿈을 꾸기엔 나이가 너무 많다
I am too young to do something in my own = 나는 뭔가를 혼자 하기엔 너무 어리다
* too old to do something = ~기엔 너무 늙었다/ 나이가 너무 많다
* too young for something= ~기엔 너무 어리다

I realised how hard it is to become a teacher. = 나는 선생님이 되는 것이 얼마나 어려운지 깨달았다.
Realised(깨달았다)/ how hard it is(얼마나 어려운지)/ to become a teacher (선생님이 되는 것).