Conversation so far:
which state in India has highest literacy rate in the census of 2011
According to Census 2011, Kerala has the highest total literacy rate
Which state in India has the lowest lieracy rate on the census of 2011
Bihar has the lowest total literacy rate on the Census of 2011.
How are the figures  on the literacy rate in Inda on the census of 2011 collected
Literacy figures are collected by census takers which essentially means literacy is self assessed.

Question: From what age are the figures collected
Self-contained rewrite: From what age are the figures on literacy in the census of India collected