Ahmedabad Plane Crash: How old plane airlines can fly? Is there DGCA guideline?

The ill-fated Air India aircraft that crashed Thursday in Ahmedabad was 11 years old. The Tata Group-owned company is the airline with one of the oldest fleets, with 70 of its aircraft being one decade old. Is there a DGCA guideline? Was Ahmedabad Plane Crash a result of flying old aircraft?
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