My Friends Chatting Man is double or tripple her age

Well my best friend has been telling me lately that she has been chatting with a man twice or almost tripple her age, I find it very wrong I mean he’s just too old for her. She tells me she chats with him online almost everyday only and she actually likes the way he is she tells me that they have a lot of things in common so im guessing that’s what she might find appealing about him, She tells me that eventhough she knows he is very old for her she likes the fact that he is mature and doesnt act like a dumb high school guy, Well I just wanted to see if anyone could give me some advice on what to tell her, in my opinion I find it wrong but she just really likes talking to him, the other day I went to my friends house and well she was chatting with him and she told me to just look at the conversation so that I would see with my own eyes that he is a nice man, Well to tell you the truth their conversations are rather friendly and nice, nothing out the ordinary, and I could just see in her face that she actually looked happy to talk with him, Well just tell me what you think about my friends situation Comment or Funmail me Thanks for taking your time reading this