After comparing my High Elf's height with fellow Altmer npcs by standing next to them, I noticed that he's the shorter one in most cases. Some actually tower over him. He's still taller than npcs from other races but appears to be a shorty amongst his kind. Have you noticed this when playing as an Altmer?

Only for first person. in third person, your as high as the average altmer.

My Altmer is still shorter than Ondelmar

Strange thing.

Perhaps a dwarfish Altmer then, perhaps?...

Yeah, that's the thing. I made the comparison in third person. He isn't shorter than all Altmer, but Ancano, Taarie and Ondolemar appear to be taller.

You are not superiorly bred Mer from Alinor

My Altmer is about the same height as Taerie, but Ancano and Ondolamar are taller than she is. I wouldn't mind her being shorter, she hates being taller than her spouse!