FTA:
“Early Viking Age raiding parties were an activity for locals and included close family members”.
Akin to today’s 4-H activities.
Most of the non-berserkers were family men-bringing sons who have come of age to raid/battle with them was custom just about everywhere at that time-training/a right of passage. Most vikings who went to sea were just as interested in profitable trading and a place to settle with a woman, have a family and make a living farming and trading somewhere warmer with more arable land than the Scandinavian countries they were from.
disclaimer-I have no viking or other northern European ancestry-My DNA is only from warmer Europe-the Spanish Pyrenees-with a bit of Native American tossed in somewhere in the the 16th-17th century-I just like to read and study the travels and habits of humans as far back as possible-it is amazing how smart and resourceful we have always been, in any environment...