It depends on who defines it.
For an insurance company, the purpose of YOUR life is to be insured up to your gills. Whether it is life, car or home, they want you to buy more and more insurance. Oh yes, mediclaim too.
For a hospital, it is to buy their service even if you don't really need it, and get billed forever.
For a car salesman, the purpose of your life is to buy cars- for yourself, your spouse, your child, your dog,...
For a cosmetics company, the purpose of your life is to look beautiful-wearing their cosmetics, tons of them.
For a credit card company, it is to get exclusive deals to SAVE more on every expensive product or service.
For a stock broker, The purpose of your life is to buy more stocks. For a bond market analyst, to invest in bonds, when all you want is to BE Bond...James Bond.
For an NGO, the purpose of your life is to help others, through them.
For a TV channel, it is to watch ads and shut off the programming, and for the newspaper, to read the ads and ignore the news. If you are a company, then you are born to give them more ads.
For your child, it is to give it an unending supply of food and gizmos (as the child grows up).
For your parents, it is to remain in touch with them.
For your boss, it is to increase his productivity- or make it appear so.
For your spouse (female), it is to be a magician, who knows everything and can produce people and things at will.
For your spouse (male), it is to be a magician, doing everything and leaving the remote control of the TV to you.
And for you? If you are still reading, there is something seriously wrong somewhere.