Dad mode out of the way, if you're looking for suggestions with a conservative, yet wide net, pursue something that has tremendous overlap. This isn't to say that something specialized like dentistry cannot be lucrative (my mom worked for one for probably 40 years - he has multiple BMWs
), just the same as a welder or a plumber. My neighbor just finished up his multimillion dollar home build by running a local spray foam insulation outfit. My suggestion is to get something with a big umbrella that can be used anywhere. Engineering, business, finance, etc. I've been in industrial powertrain, pest control, healthcare, agriculture, mining, blah blah blah...Second on kicking off retirement good and early. I opened my first retirement account at 14 - knock on wood, getting where I want for retirement figures "should" be a breeze. As such, it opens up some fun money until then without going into worry mode about the future.