Keloids can occur anywhere on the body as a result of skin inflammation or injury. In my practice, I usually opt for nonsurgical treatments first followed by surgery if necessary. Our patients benefit from multi-modality protocols that include scar modulation, application of Plato's Scar Serum...
In all likelihood a crooked nose cannot be repositioned without breaking it. A non-surgical rhinoplasty may provide you with some temporary improvement.
The right age for nasal shaping depend on facial growth and maturity. Most girls will be finishing their growth spurt by 15 years, longer for boys. By 15 years results from rhinoplasty are safe and stable.
Best of luck,
peterejohnsonmd