No matter how you change your lifestyle pattern, even if you avoid glamorous activities if your salary is enough for monthly needs, you cannot afford to keep or save 1/3 of it. We are working to meet our daily needs, suppressing ourselves of basic needs in order to save 1/3 of the money we earn will have give us more negative gain than positive. If we failed to nourish ourselves because we aimed to save 1/3 of our profit, we might end up spending it all to address our health problems and even can lead us to debt.
So before saying anything about how easy to save 1/3 of our savings, we must navigate and learn first the capability of every person. Not because we are able to do it because we have parents that actually spend for our needs and we have our earnings all by ourselves doesn't apply to all people.