To extend Cliff's female Geezerhood thinking a little further, a co-worker's 70 year mother recently called thhe office in a dilemna: she was locked in a washroom stall at the mall. It wasn't an emergency, nobody seemed to be responding to her yells, her throat was sore but she had a cel phone and knew her daughter's work number.
Arthritis prevented her from just crawling under. Male Geezers, of course, aren't exempt from this happening to them, but it's more likely for female Geezers.
Carry a cel phone and a whistle. Those personal alarms for home aren't a bad idea either.