FACT: “elderly” is a relative term. A 5-year old considers a 10-year old to be elderly. Therefore everyone is Elderly to someone.

FACT: if you cannot get pregnant, then you are Pregnancy Disabled. (Case 2a: if you can get pregnant but are not currently pregnant, then you are Not Able to prove Pregnancy at the moment. Case 2b: if you can get pregnant and are indeed currently Pregnant, then you are things you are Not Able to currently do that you could before.) Therefore everyone is Disabled Pregnant.

FACT: everyone is the Child of someone else.

THEREFORE: everyone is a member of the set: Disabled Elderly Pregnant Children. Everyone may use this toilet.