No it's not. There have always been so gle women in their 30s, and even older, who don't have children.

Ever hear of nuns?

In many cultures it has always been trasition for one daughter to not marry and stay home toncate for aging parents and grandparents.

Until we started warehousing our old folks so the nuclear family could exist, it was not uncommon for any siblings who did bot want to marry, male or female, to live within the extended family and add to farm labor (or other labor) and help with the kids.

You're peddling more bullshit as though you know what the hell you're talking about. You don't.