#t-statistic

For 170 married couples, a regression of wife's age on husband's age gives a slope of 0.9112 with standard error 0.0259 (the software reports $t = 35.25$ on $df = 168$). To check whether the age gap between spouses is the same at all ages, you test $H_0: \beta_1 = 1$. What is the test statistic?