A geriatric
You call them elderly or an elder.
A person that is very old is commonly referred to as elderly or a senior citizen.
(Land) Lord. Wealthy.
They are probably looking for Ent. They were very old creatures that looked like trees.
A very very confused person.
Old
you call them wealthy.
a banchee or a VERY VERY VERY annoying person with terets or ADD
A Senior Citizen?
A genius.
Happy or a very lighthearted person.
a very intelligent person.
Parsimonius A miser "schrooge"