Why are you defending her? Sometimes these things are common sense.
Im sorry if truth hurts.
You have to ask "to what end"
What is the point of mentioning and focusing on it? What does the person saying "she dated an older man when she was young in her career" want you to conclude with that information?
The answer is "oh so she's only gotten as far as she has based on getting on the good side of other more powerful people and she was willing to use her body to do it. She's not qualified because she didn't work hard enough!"
As opposed to whom? A man who is only in court as a defendant, who has raped teenagers with epstein including a 13 year old in new York, and has no political experience aside from winning the election because of the electoral college 8 years ago?
It's a meaningless point that doesn't say anything about her eligibility to enact policy and listen to experts who know what they're talking about. It doesn't say anything on how she actually governs as an elected official. It doesn't say anything about her education level or court record.
If the goal is to say it's a sign of low character, it would make sense if she wasn't running against a convicted felon, white supremacist, multiple divorced libertine, and all around piece of shyt whose laziness and incompetence got thousands of people killed in 2020.