From all that, it works out that on average, girls start dating older in Israel. It is known that in Israel girls start later and boys start younger and that is one reason given for the lack of (or less of) a shidduch crisis in EY than in the US.
In EY, the girls are usually 20 & the boys are 21, whereas in the US, the girls are usually 19 & the boys are 23 or 24.