You would be surprised at how many people, even those up in age have not made funeral arrangements.
Though it is best of course to plan and save for these things at an early age in life, it is never to late to make plans. Most people know whether they want to be cremated or buried. Cremation is less expensive.
Faith plays a big part in this decision process. Family dynamics and the make up are factors too.
A will of your estate is recommended too. The legacy we leave behind defines your family history. Thus if it can be said at the wake that you left them without a burden, you leave a legacy of responsibility and love.