At what age can I get a loan of this size?

[Cole Domino]

Hello, 

I am 18 years old and almost 19, The month turned 18 I got a secured credit card and next month there upgrading me to a unsecured card and Im looking to get another credit card so I build more credit, I have had the same job for a year, I have $26,000 in a brokerage, and about another $4000 in the coming months, and I grow on average 8%, when and where should I plan to be able to get a loan. And at what range am I talking for a loan. My credit score is at 696.