There's no significant difference in meaning between 1 and 2. Number 3 is less likely than number 4.
[EDIT] The continuous tense is more natural for the situation in 3 and 4 because "going out" is a repeated, habitual activity. "Living" is a continuous process which (even though you'd think a "continuous" tense would be perfect) can be described equally well with the simple past or present perfect continuous tense.

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