All variables are not significant, but intercept is I am using SPSS for the first time and just trying to make sense of my findings.
I had two IV (nationality, age group), each with 2 levels (English-non English; young-old), which is why I ran a 2x2 ANOVA on SPSS. All my hypotheses were null, as no significance was found between the variables(nationality; age group; age group*nationality). However, the intercept has a p-value of p<.001
So, I'm a bit confused on how to interpret my data...

It means the slope of your intercept was greater than 0 (and outside the confidence intervals too). Depending on your software your using, the intercept usually just happens to be the first variable in your dataset (this is how it works in R)  unless you specify it otherwise.
