I think it's possible to have a little fun with your titles without them being "misleading". And in this case there's a reading that's straightforwardly correct: there's an abstract "Average Founder", and each year that hypothetical person is six months older than the prior year's Average Founder.
The title clearly states that the average founder doesn't grow old as fast as everyone else. I assume ur actually meant that the age of the average find increases 6 months every year. So, no, not very clear