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1.
1.when someone says they are going to leave to do something but actually stay and stare at whatever you are doing.

2.when people barge into your house uninvited and look all over you house for no apparent reason and leave.
1. Son: "Yeah Dad, i'm just watchin some videos"

Dad: "OK son, i'll just be upstairs"

*moves somewhere to secretly watch what your doing*

Son: "Dad... your Old People's Syndrome is kicking in again..."

2. Me: "So my aunt and uncle came over when I was alone at my house and searched my whole house for nothing at all."

Friend: "Yeah dude, it sounds like your aunt and uncle have Old People's Syndrome."
by ElementProj March 24, 2011