how come

[Ju]

a. How come you look so young at the age of 50?
b. Why do you look so young at the age of 50?

__________________________________________________ _____

1. Are the above sentences correct in grammer?

2. Are the above sentences the same in terms of meanings?

3. Is how come more causal in coversation that we should not use it causally but only to the closed friends?

4. What are the differences between in terms of and based on?
Can I rewrite the question 2 to :

Are the above sentences are the same based on the meanings?

__________________________________________________ ___________


ju

[freezeframe]

a. How come you look so young at the age of 50?
b. Why do you look so young at the age of 50?

__________________________________________________ _____

1. Are the above sentences correct in grammear?

2. Are the above sentences the same in terms of meanings?

3. Is how come more caussual in conversation that and we should not use it caussually but only to with the closed friends?

4. What are the differences between in terms of and based on?
Can I rewrite the question 2 to :

Are the above sentences are the same based on their meanings?

__________________________________________________ ___________


ju

How come is colloquial but it's not restricted to "close friends".

Your first two sentences are correct but we wouldn't say that. It sounds a little rude. You can say "You look great! And so young! What's your secret?" or "How do you manage to look so young?!" or something like that...