I've seen this image pop up now and then for like 10+ years as a meme in the Linux community and never not once did I think this.

Obviously if that's a confirmed intention behind it, then it's not okay, but I think you're overthinking it, it's just how anime designs are, the characters often look agelessly young.

These look like pretty average anime characters to me and don't strike me as implying something problematic in the slightest.

Idk I'm an outside observer to weeb shit, but that's how I always interpreted it at least.