Almost everything in Hinduism is not prescribed strictly because Hinduism is really an amalgamation of many separate beliefs systems / traditions / ritual / books, etc. which were followed by local cohorts.
That's why many books contradict each other. Some books prescribe an age and order for such steps, others don't, etc. They weren't meant to be all collected, all studied, and all chosen piecemeal by one observer. But over time it has evolved into a much different thing than when it started
That's why many books contradict each other. Some books prescribe an age and order for such steps, others don't, etc. They weren't meant to be all collected, all studied, and all chosen piecemeal by one observer. But over time it has evolved into a much different thing than when it started