How far back are you going and where?
Some did get married pretty young, but IIRC, the average age of getting married, at this time point, was a bit older than 16...more like 18-20 or even 23.
In a straight line about 450 years, gets a bit confused before that. One of the nice things about being a genetic odd ball in a rather homogeneous place is that is that makes tracing easier.