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I have been talking on the phone and texting with a younger girl whos 19 and I am 28. She recently sent a mass text to all her friends on her phone including me inviting me to her party. I figure she wants me there but how would I go about going and not feeling uncomfortable? I mean all these girls will be like 19. Should I bring a friend? I don't want to feel weird being 28 at a party full of 19 year olds. Please give me some advice on this, thanks so much!
Well, if she has seen a current picture of you, and knows how old you are than she clearly doesn’t have a problem with the age difference, she may even think its good becuase you are more mature or supposedly then men around her age (many 19 year olds girls end up with older men some even older than you, it is becoming pretty normal in today’s society.) 
i myself am a little younger than her and i am routinely trying to game women 19-30 (Maby one say i will go above 30 depends if i meet a hot cougar lol!)Back on topic, just dress normal, maybe bring a friend, (after all if it was your party she would bring a friend.... as long as she says it’s ok that is)
There is no reason to feel uncomfortable around people younger than you, it is common place in today’s society, and you need to have complete confidence in yourself because you are going to her environment.