Absolutely not - but it'd probably be a good idea to find (hire or partner with) those who are strong where you're weak. Check this out - http://www.scribd.com/doc/17772299/Anatomy-of-an-Entrepreneu... - it gives an outline of what the typical entrepreneur looks like. For starters, a typical entrepreneur isn't just coming out of university (and that includes entrepreneurs of tech startups).
One methodological issue as I reread that paper: "We allowed company executives to tell us if they were a founder. The guidelines we provided for defining a founder was 'an early employee, who typically joined the company in its first year, before the company developed its products and perfected its business model.'"
Companies often give out the co-founder title to early employees, but that's not what we think of when we read that 'most founders are 40' here at HN.
I never thought I'd find myself suggesting a PDF version, but I really do hate iPaper that much. If only Scribd had put all that effort into doing a PDF to HTML converter that doesn't suck...
