Does excessive masterbution from age 15(male) in any way stop or restrict height growth or interfere in the genetically determined height.exp clearly?

Height: No , there is absolutely no effect on height by masturbation, excessive ( how are you defining this) or otherwise. There may be reasons for this behavior, but the effect s do not influence height.

No Relationship: If it were, there would be a lot more short people. Short height, however, could be affected by genetics, poor nourishment, very low body fat (like in some athletes), extreme dieting, testosterone/estrogen or testosterone/estrogen-like supplements.