I think Babs ages like every woman dreams of. She went from being at least 25, probably a little older (to be a congresswoman she had to at least be 25) to currently being, all these years later, about 21.
She was 25 here. This is issue #1 of the Batman Family series, and in issue #10 of that same series she explicitly refers to herself as being 25.
Of course, that’s still kind of problematic because when she was introduced roughly a decade earlier, she already had her PhD, which should have already made her around 25. And you can’t just say that none of the characters aged in that time, because Dick went from being somewhere around 16(?) to 18 and in college in that same time period.
So either she got her PhD early by skipping some grades (which is certainly possible - she’s definitely smart enough, and when her origin was retold post-Crisis in Secret Origins #20, Flawed Gems, her skipping grades was made canon. But that origin story also made no reference to her having had a PhD when she became Batgirl, just that she had already graduated from college) or else they had already started retconning her age down a little.
And that concludes your lesson in “The History of Babs and Dick and Their Ever-Decreasing Age Difference” for today, kids. XD
What I actually find the most interesting about these panels is that it’s a rare instance where we see Barbara’s opinion of Dick based purely on his civilian identity, before she figured out that he was the same kid who fought crime with her in short-pants. She obviously thinks highly of him, and bonded with him quickly enough that she’s disappointed that he has to go back to college. I like the fact that they worked well together and immediately took to each other out-of-costume as well as in. I think it says a lot about why they’re so perfect for each other. They didn’t just make a great team because they happened to be Robin and Batgirl at the same time. They made a great team because of who they were.
It’s also pretty interesting to hear Barbara saying that she hopes Dick will turn out to be “more than a worthless playboy”, since he kinda does have something of a reputation as a playboy these days (albeit not a worthless one). That’s still not how I interpret his character personally, but I know that others do see him that way.