[romanovcode]

Technical product owner is the only one I can think of.

You could also be technical lead/CTO, however since you are big fan of functional programming you will more likely push your preferences onto other workers and they will hate you.

[scalatohaskell]

I've been told multiple times that people see me as a CTO later. Thing is, I'm still pretty young, and I call it usually bullshit. I'm nowhere near CTO. Maybe in 15 years.

I like to help, explain, prototype. Help understand frameworks etc.

[romanovcode]

Imposter syndrome. If you are skilled enough it doesn't matter much how young you are.

[eropple]

To a degree, it does. I'm 29, and a big part of why I'm contracting/consulting right now is because my resume is a decent bit more advanced than my hairline is receded. There's some "look the part" involved.

[UK-AL]

In the startups arena in my area, i'm surprised when I see a CTO or CEO over 35 tbh.

Average seems 27/28

[lj3]

You could try bootstrapping your own product. No need to go big, either. A small web service you write on the side will give you valuable experience if you decide to go the CTO route in 10-15 years.