The wage gap between never marrieds (men and women) doesn't exist. The wage gap comes into play when people marry, as women assume a larger portion of the household chores (typically) and may engage in pregnancy and child rearing. This sets back their career curve. It's no big secret.
The feminists and cultural leftists however love to blame it all on evil white men, but the statistics dont bear out that case.
Many men and women who advance far have no family, smaller families or no children at all.