Was I out of line calling my 37-year-old sister-in-law middle aged?

she's 37. She was arguing with me about some feminist crap, she thinks I keep her little sister barefoot and pregnant in the kitchen after I vetoed my wife loaning her $10,000 which she would never pay back for a new car. Been getting texts, letters, angry phone calls etc since. She actually tried to get her latest boyfriend to fight me, he laughed and shook me hand and hasn't been seen since. I've been pretty decent all the way through.

Was I out of line calling my 37-year-old sister-in-law middle aged?
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