<prompt> Human: So along with the title information, Ive got rent of 800month all things included, 120 in car payment, with no other debts, for now. I would consider myself risk tolerant in terms of my money at this age. Im putting my savings into a fidelity account that Ill invest in mostly growth ETFs for now, as Id like to ride the market while avoiding fees as much as possible. So, I need a number. Im looking at 18 right now, any recommendations given my situation?  <response>: 50, lets get serious! 