"Ancient" is another word for very old.
ancient
Old English bæcere, from another Old English word, bacan (to bake).
mature
The word you're looking for is "antiquated," which can sometimes be associated with being very old or outdated. However, if you are specifically looking for a word with "ie" or "ei" that means very old, "ancient" fits the meaning but does not contain those letter combinations. Unfortunately, there isn’t a widely recognized word that fits all your criteria perfectly.
The word ancient is an adjective. It means very old.
ancient
'Ancient' is one, as is 'elderly'.
age-old
Another word for not old is young.
Vexed is a very old fashioned word meaning unhappy or angry. it can also mean cursed or to have a spell on you.
another word for very large
An afternoon out is the hint word for another word for a very special afternoon. An afternoon date is another word for the same.
Another word for 40 year old is 4 decades. 8D
Ancient
Another word for 'very bad' is, "Heinous" (HAY nuss). Another word is, "Dire".
Another word for slum or very poor area is "shantytown" or "ghetto."
Another word for an old female cat is a grimalkin.