How should i handle this?

Being in a similar situation myself I can see why she did that. It's so she doesn't lose you as a friend and she's taken extra precautions (facebook account). If she really is older, she's thinking you won't like her anymore because she's well an older woman. You don't exactly see a 35 yr old hanging out with a bunch of 20 yr olds. Also, that might be how she looks, makeup ages the face alot giving the appearance of being older. I would talk to her about it but gently. She's helped you through some times in your life, throwing it away would be a waste and would you really want to give it up?