He’s dating the women who are into him.
Your mom hurt him.
He’s still healing.
He’s looking for safe women to date.
Women who appreciate him.
Maybe women in that age range do appreciate him.
Middle aged women might not be into him.
Maybe middle aged women don’t like things about him that your mom also didn’t like.
He’s your dad, not your partner.
If he was your son or your brother you’d be supportive of him as he tries to find women who like him after a break up, wouldn’t you?
Well, your dad also shares half your genes just like your son (would, if you don’t have one yet) or brother (does, if you have a brother, or would, if you had a brother), so you can choose to cut him some slack if you can’t be supportive of him.
He’s not replacing you with those young women, he’s replacing your mom who has already replaced him with another man, lmao, so those women are no threat to your mom, and definitely not to you, you are his daughter, he’ll always love you more than any other women in his life.
If it’s the age thing then you should take note that he’s meeting these adult women on his own, those women aren’t from your social circles, he’s not dating your friends, so there’s no cringe factor there, he’s dating women from his social circles, so why should that be a problem for you?
He can only date women who are into him.
He doesn’t have a choice in which women like him.
No man does.