What age gap starts to feel parental rather than romantic?

Say if the woman is 29. I assume it would be 20 plus year gap or would men just see her as any other woman if she’s 29 as that’s not a kid. I think it’s 24 and under she’s still feel like a kid? I imagine older women would feel differently to men on this for a younger guy feeling like their son or for lesbians like daughter?

What age gap starts to feel parental rather than romantic?
Post Opinion