Low key, I think a lot of us exhibit similar personality traits that might make it easier to tell if they are abdl or just dl.
What I mean is people who are nerdy, lower self esteem, with more obvious signs of anxiety. Add that with a more youthful appearance (they could be 40 but look in there 20s) I see some people like this at my job and while I have no proof of fact, some of them just give strong abdl vibes.
There’s an episode of Kitchen Nightmares where Gordon Ramsey visits a small pizzeria in Eagle Rock California owned by two twins. They don’t straight out say they’re into abdl, but their personalities make it seem very likely. What’s more is Ramsey makes a lot of baby references towards the, I think he picked it up as well.