2nd cousin once removed dating
In this case, the smaller number of generations to the common ancestor is used to determine the degree, and the difference in generations determines the number of times removed.
Note that the ages of the cousins are irrelevant to the definition of the cousin relationship.
Two people for whom a first cousin relationship is one generation removed.
The child of one's first cousin; also the first cousin of one's parent.
However, in common parlance, "cousins" typically refers to "first cousins" as the children of one's uncles and aunts.
Systems of "degrees" and "removals" are used in the English-speaking world to describe the exact relationship between two cousins (in the broad sense) and the ancestor they have in common.
The grandchildren of two first cousins; also the children of two second cousins. Sam and Lyla are third cousins because they are non-second cousins, non-first cousins and non-siblings who share great-great-grandparents.
For example, having "great-great-grandparents" in common would be third cousins.
When the cousins are not the same generation, they are described as "removed".
David and Irene are double first cousins because each is related through their mother's family and also their father's family, the result of a brother and sister (Ben and Helen) having married another brother and sister (Hugh and Betty).
For David and Irene, each has a mother who is an aunt by blood of the other and a father who is an uncle by blood of the other.