Alright, my 2¢.
I’m 44. I started karting in the mid 80s, and from ‘86 to ‘93, I was at the track every Saturday from mid April to Halloween, sun up to sun down. Going to college meant that road racing, which we dabbled in before, became the norm for us, because it fit my availability. That continued until about almost 5 years ago, when we returned to sprint racing.
Sure, aging doesn’t help, but the one thing that makes the biggest difference is seat time. Think about when the general consensus says we slow down: the mid 20s. We might go to college, get a career, get married, get a mortgage, have kids. All these milestones in life, though many of us wouldn’t trade them, take away from seat time. Of course, being younger can be an advantage, but look at who’s fast: the drivers that bang it out every single weekend regardless of age.
Sure, at this point, I need to be more conscious of my nutrition, exercise and hydration, but I’d have to pay more attention to those things regardless of whether or not I’m karting, and, because I do, I have enough stamina that, if we tacked two more heat races to a Route 66 daily schedule (if time ever permitted), I could handle it. What keeps me from going faster is that seat time thing that those adult responsibilities prevent.