Both sentences would be correct if the first letter of each sentence were capitalized. Was there some reason you thought only "will" or "is going to be" was correct? Which one did you think was the only correct answer? Again, both "My dad will be sixty next year" and "My dad is going to be sixty next year" are correct.
Again, Mohsen, both "will be" and "is going to be" are perfectly correct in that sentence and in any sentence like it. When English speakers speak of someone's being a certain age at a certain time, we frequently and correctly use either form.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .