Indian English habitYears back
Indian English: a long time in the past.
Years back, Arjun lived in Jaipur.
Works everywhere: a long time before now.
Years ago, Arjun lived in Jaipur.
Remember: 'Years back' is understood, but sounds casual outside India. In formal writing, use 'ago': 'five years ago'.
Short lessonIndian English habitsIndian English is a real variety. Some phrases need a switch for international listeners.