Something that just occurred to me; is the bordure around your arms a distinction indicative of cadency?

In other words, does this represent you as being the eldest son of the second son (your father), or (forgetting about the label for a moment) is this the bordure you would apply as the second son of your father? I'm thinking it must be the former, if the latter the bordure would not be applied during infancy (under the heraldic age of 21), only the label. When reaching maturity (21) the label would be discarded and the appropriate cadency mark or bordure would be applied.