[cthulhuology]

No age is too old. I co-founded a startup last year, successfully raised a 8 figure series A, and am the youngest of founders by more than a decade, and I'm over 35.

The difference between now (startup #4 for me) and when I was in my 20s, is now I waste a lot less time and energy on things that don't matter.

My advice is start consulting on something you know just slightly better than the next guy. You can often jumpstart a product development plan by helping a large company define a product they need. Then make that if more than one company really needs it :)