I fantasize about my wife in older pictures when she was thin.
What age was she in the pictures?
I mainly fantasize about her in her mid twenties.
You really should accept your wife as she is. She may no longer be thin, but she's your wife and you love her.
I'm just fantasizing about her when she is thin.
Everyone has some fantasies, and yours is probably pretty normal. But I hope that you are kind to your wife and still accept her as she is. We all change over time.