Is this a correct of the question?

'Would' suggests to me that he may no longer be alive. I would use only 'will'.

Can't we use 'would' here to guess? like: 'He would be twenty this year' means 'I think he is twenty this year or I guess he is twenty this year'. Am I correct? please help.

I would love to get the answers from others. please.

"Will" sounds better. It could still be used to guess: "I think he will be twenty this year."

tenjingCan't we use 'would' here to guess? like: 'He would be twenty this year' means 'I think he is twenty this year or I guess he is twenty this year'.

Yes, I think you could do that, but in my experience it's pretty rare for anyone to phrase it like that. As for someone who is already dead, I would use: He would have been 20 this year.

No, the guy I am taking about is still alive. If so..?

tenjingNo, the guy I am taking about is still alive. If so..?

As already discussed. Use "will", very rarely "would". "would" doesn't sound right in an answer to "How old is he?"

"would" requires a situation where the speaker is not at all certain, possibly because he has not seen the person whose birthday it is for quite a long time, possibly becaus

suppose,I have a friend. His name is Alex. I haven't seen him for almost fifteen years. I have almost forgotton what he looks like. And today I am talking about him with my another friend, Jack. Jack asks me,"How old is your friend?" And I say,"He would be twenty this year". Here the use of would is correct, right??

tenjingHere the use of would is correct, right?

It's OK, but not great. I don't recommend it as a first choice. Anyway, it's not the only word you could use. "should" is also possible. Adding "I think" at the beginning helps convey the uncertainty.

[I think he / It seems to me that he] [ will be / should be / would be / might be turning / is proba