Delay gratification = Success throughout life

I live in a house dominated by strong women (wife / daughter) - they are both instant gratification seekers; when they want something they want it now, in 2 seconds is too late, they want it yesterday. Maybe you know people like this, it's not unique to girls but in my opinion appears to be more prevalent in todays society.

I recently watched a short film (6 minutes) from TED by Joachim de Posada who watched and conducted a study both in the US (Stanford) and South America. Rather than describe the study I enclose it:

I find this fascinating - as someone that has experienced fantastic success and also been part of less successful enterprises I wonder about my own ability as a youngster to delay gratification. Assessing this element of your psyche now reveals what? Could you wait as a child?