See link When to change? / Buying Guide / Home - www.michelin.in.
Go to the section" If your tyre is over aged".
It is avaiable on the Indian website also.
The text is anyway reproduced here for reference.
Quote
"The usable life of tyres varies enormously and is impossible to predict. For this reason, Michelin recommends that all drivers pay attention to the external appearance of their tyres, to any loss of inflation pressure or any abnormal occurrence (vibration, noise, lateral pull) which might demonstrate the need to replace them.
Moreover, in addition to regular inspections and tyre pressure adjustment, Michelin also recommends that all tyres (including those on spare wheels, trailers, caravans and camping cars), are inspected regularly by a tyre specialist, who can assess whether they should continue in service. After five years or more of use, this inspection must be carried out at least once a year. Where necessary, follow the manufacturer’s recommendations on replacement of original parts. As a precaution, if the tyres have not been replaced 10 years from their date of manufacture, Michelin recommends replacing them with new tyres even if they appear to be in usable condition and have not worn down to the tread wear indicator. "
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