The good news about starting a side hustle online is there’s no age cut off, no employment reference check, no having to get dressed for a job interview, no having to ask for a raise, no having to work around people, no having to get dressed for work, and you can take as many breaks as you desire all while still getting paid. Only thing is, you have to put away your own money for retirement (if you do decide to later on), pay your own healthcare, and money for additional costs.
I surprisingly get a lot of people asking to detail their car. I never intend to make a business of it, but I love doing it to my cars and people ask me to do it to theirs. All it takes is a cheap orbital buffer (mines a used craftsman) and a shop vac. I normally get easily $100 for a basic wash/wax/vac, or $200 to remove scratches and polish then wax the car.