My DP's kids ages 15-9 use them all the time, the first time I heard them say it I thought that DP would pull them up on it but he didn't. I asked him about it when I realised that they use them all the time and it turns out that its not swearing in his book.
My kids were raised to think that it is and were pretty shocked when they heard kids "swear". I know that they aren't saying the F word or C word but even so I don't think its right.
I am absolutely not a prude at all and like a good swear as much as the next person however I'm an adult!!