I know Rayllum shippers really want Callum to get taller than Rayla during a time skip or so. I don’t think that will happen because in canon every elf character we see are just proportionally taller than humans. Observe how Runaan is taller than the two adult human fathers, Harrow and Viren:
Then we see Rayla compared to Callum
I know she’s shorter than Claudia and Soren but Rayla is still a child and only 15 and when she gets older, she’ll still be taller than Callum.
Look how much larger Runaan is when fighting the human soldier
Amaya is no waif but she looks absolutely dainty next to the Sunfire elf.
Let’s not forget 6'6 plus 6'9 Aaravos ;). Even inside the mirror he looks and is taller than Viren
See the elves in this frame, they are all taller than humans. Look how forcefully they shove and drag the humans out, not only do they see humans as lesser in both lacking in magic but in height also. To elves, humans are beneath them and that seems to be quite literally as well.