Those are great questions! There isn’t currently a draft/forced conscription, but Soren felt compelled by the family’s military history to enlist. It’s his own sense of duty that made his enlistment inevitable rather than a legal requirement to do so. The protagonist doesn’t have a set age, but I usually consider them to be somewhere in their mid twenties to early thirties. A significantly older protagonist may need a little looser interpretation of canon, but anything early twenties and up could work if you squint!