Let me say up front that day trading is a waste of time and money. You are much better off investing in long-term trends and dominant companies that are consistently growing their earnings.
I first started day trading junior year in college. It was an expensive endeavor since each trade cost $10 at the time and I only had a $3,000 portfolio. The most I ever made was $500 one day trading Books-A-Million stock (BAMM), which is now no more.
I continued to day trade all throughout my 20s while working on Wall Street. We were allowed to trade ETFs and individual companies that were not on the restricted trading list.
Day trading proved to be a career-limiting move because it was a distraction. I was pulled aside a couple times by my manager to tone things down, so I did.
Once I hit my 30s, I no longer day traded nearly as much. I realized I could make much more money if I focused on my career. Further, having to reconcile all my trades during tax season was a royal PITA.