Yes, there are tours and packages being offered by certain travel agencies that specifically cater to senior citizens. All you really need to do is go online and look. For a start, I highly recommend that you go to the official website of Senior Citizen Travel (Senior Citizen Travel | Discounts & Destinations for Senior Citizens) and look for listings there about travel itineraries in India for seniors. If you can't find one there, you can always contact any travel agency that promotes India tours and ask if they can redirect you to an agency that offers senior tours.