When you are a fairly attractive person but you can't seem to maintain a relationship regardless of how attractive you are.
SUE: My boyfriend broke up with me. I thought we had a great relationship. I don't understand why I can't manage to stay in a good relationship.
LORI: Girl...you got Jennifer Aniston Syndrome.
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Noun.
When you seem to not age at all or even age backwards. Usually by way of plastic surgery.
Rebecca: Wow! You actually look younger than the last time I saw you!
Sheryl: Well, I did get diagnosed with Jennifer Aniston Syndrome