What do you think an acceptable age gap is in a relationship?
As long as both parties are over 18, anything is 'acceptable'. If one of the parties is under 18 and one is over, it starts to get a bit tricky.
I personally cannot see myself dating anyone younger than myself. I even thought one guy I went out with who was two years older than me was too immature for me, so I think the age gap of my current relationship is pretty good (5 years).
Can girls be older than boys?
Sure, why not?
How much does this change with different ages?
As others have pointed out, by the time you get into your twenties it seems to right itself a bit if you're in an age-gap relationship.
Whats the maximum sensible age gap?
I wouldn't like to say. Emotionally speaking I would say none, but practically speaking, 25 years+ is probably too much.
Disadvantages/advantages of age gaps?
Disadvantages - if the age gap is very big you might be at too different a life stage to your partner for things to work out; practically you might face becoming a widow very young when your partner dies; emotionally you may upset your families who may not be able to accept the enormity of the age gap.
Advantages - you stand more of a chance of finding someone who is in line with you emotionally and in terms of maturity.
How bigger gap does it have to be to be sick?
While age gaps of 25 years+ seem odd to us, I don't think we have the right to judge as we don't know the people or their emotions (unless you do know them and it is blatantly abuse of some kind).