Where does “geriatric” come from?

I notice the etymology chain provided only shows English forms repeating without any older language sources. I cannot write an accurate origin summary without the actual etymological chain showing the word's derivation from older languages. To complete this task properly, I would need the chain to show something like: English geriatric ← [language] [form] ← [language] [form], etc., going back to the root. Could you provide the complete etymology chain showing the older language sources?

geriatric (English): Relating to the elderly; Elderly, old; Relating...