Is a 40 year old female sleeping with an 18 year old boy weird

So we have a new girl at work and we have arranged to have a few drinks together and I was asking her what she is like after a few drinks and she said she was wild. I said what do you mean wild and she said well when she turned 40 she went crazy sleeping with everyone she said I was sleeping with 18 year old boys all the time and having threesomes with them and everything and laughing but like I thought it was really creepy??? I know there off age and to guys that’s like an achievement but I dunno if it was a 40 year old guy and 18 year old girl people would be grossed out