Reword that, matey. Geriatrics aren't that obese, usually, and don't come with toddlers in tow. It's obese 25-year-olds, sweating, smelly, tattooed, with toddlers in tow that frighten me.
And very likely pi$$ed or stoned to the eyeballs!
I wonder how many times an 'unsuitable' pax has occupied an emergency exit seat and has been replaced by a 'fit and strong' younger person who takes it upon him/herself to get 'well refreshed' and becomes unconscious for the majority of the flight.
I am not criticising the airline policies, but I wonder how many passengers would be so keen on occupying those seats if an in flight alcohol ban was a condition of obtaining them.