It's impossible to answer this without knowing:
- whether you are male or female
- which country you have spent most of your life in
- how old you are now
- your current health
- your habits (smoking, drinking, being reckless)
- your family's health history (early deaths from cancer for example)
Life expectancy varies widely between countries, ranging from 32 years for men in Swaziland in Southern Africa to 87 years for women in Macau. .
You can try looking up life expectancy calculators in Wikia Search where some sites allow you to specify the variables above to give you an estimate.