The comments on your question seem correct to me - that the word "ever" is used to enhance the meaning of "since".
There are some distinctions I would make:
Ever since that day, he has been like a different person.
This implies that something happened on that day that changed him, and he has been acting differently every day, consistently, between then and now.
Since that day, he has become a different person.
With "since", and no "ever", I can write a sentence that implies that he has changed somehow between then and now, but I don't say when. He could have changed three days after "that day", or it could have been yesterday. (This sentence also implies that the change happened because of some reason unrelated to "that day".)
Additionally, the word "ever" can be used to differentiate "since" from its other meaning, as a synonym for "because". Consider:
Since she started wearing purple, he has been wearing blue.
This could mean either that he started wearing blue because she started wearing purple, or that he started wearing blue after she started wearing purple, for reasons unconnected.
Ever since she started wearing purple, he has been wearing blue.
This sentence can only have the second meaning - that his wearing blue started after her wearing purple, but not necessarily as a result of it.
The interrogative form of verbs in the present simple is formed with DO, not BE. "Where do you come from?" is therefore correct; "Where are you come from?" is not correct.
When BE is functioning as a main verb, DO is not used as an auxiliary for the interrogative: "Where are you from?"
When BE (or any other verb) is functioning as an auxiliary, the interrogative is formed by subject-verb inversion: "Where are you coming from?"
Best Answer
Here are some typical responses:
My first example includes the reference to your sentences, since I encourage you to feel confident with speaking the way you feel natural or what you want to express. Especially since you're asking what is natural you're likely to develop a natural style of your own.
Note: In this case, whole life and entire life mean the same thing.