The tradition of respecting your elders if India comes from the fact that those who are older than you have learned things the hard way. They have wisdom to pass on, and often feel more inclined to pass it along when they are treated properly. In the West, we have a saying that “respect is earned” and not rightly given when it’s among the most basic rights of a human to be treated humanely.
However, the Indian culture also has a lot of involvement of the elders. They’re involved in raising children, in work, in everything. They aren’t pushed aside like those in the USA or other western countries are sometimes. To make it so that everyone gets along, it makes sense that people in India are taught to respect their elders from a young age.