So we have the
Silent Generation (born 20's and 30's),
Baby Boomers (40's and 50's),
Generation X (60's and 70's),
Millennials (80's and 90's)
So what about this generation ?
The answer to this will depend on the country administering the mobile number you want to find out about. Most country's telecommunication services are designed for compatibility as defined by organizations such as this website