My friends basically disowned me for being 37 dating a 21 year old, how should I go about this?

Basically, I met this 21 year old women about a month ago and we started seeing eachother. My "friends" had questioned it a few times, talking against me about it, saying that she was very young, etc. When I revealed that we were about to become serious, they essentially stopped talking to or messaging me except for one. I'm going to try to work passed this and find folks that would support me instead. I don't understand why they would do this. I need a little support and comfort in these rough times.
My friends basically disowned me for being 37 dating a 21 year old, how should I go about this?
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