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.

I thought the title was pretty clear.

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

If the title was true they actually age slower. Begin a startup to extend your life!

Haha that is fair - i thought they age an extra 6 months due to all the stress