6'3" is pretty tall for a mexican of his generation, my generation has tons of 5'10-6' talls, I have a few 5'7-5'8" friends who are called short here in Mexico, I averaged a sample and it came out at 5'9.5", Im an inch under that and can tell most people towers me going outside, one inch really makes the difference when you are short.
If I want my kids to be taller than me by a 55% chance she has to be less than 5" shorter than my height, im 5'8", if I have kids they would be shorter than me at this point, in a future generation where average will be 6'1", they would end up roping, I'm the dead end, it's over.