i would say the age your start, the time you put studing and maybe the quality of your teacher > everything else that is usually mentionned.
Skills like memory, visualisation, etc... will be aquired proprely if you have a serious learning of chess in early age.
Bb_gum234, that's the kinda answer I was looking for, very specific. Chess, like any of life's many endeavours, requires knowledge and skills... the knowledge feeds the skills while the skills execute and apply the knowledge.
TheGreatOogieBoogie, tactics would fall under knowledge, calculation under skill.
Other oft-overlooked skills would include superior board vision (more knowledge than skill) and infinite-depth visualisation of ANY position, line, or entire game(s).