One way to spot an aging control-freak geek: after 55 we count down to the target zone. 
One of the things we ponder is how much exercise we can take at which age. CrossFit is great at 55 , but it ain’t gonna fly at 80. On the other hand, gotta max out the amyloid clearance while we can.
So when do we go from CrossFit to things like TRX, or even road biking, swimming, XC skiing, hiking and the like ? When do we transition to power-assisted trikes ?
These numbers on the 2011 Chicago Triathlon finishing times provide some insight:
Yeah, this is an elite group, and by the time we get to the 80+ group we’re talking super-duper-elite.
Still, it’s an interesting story about what happens to the “average” elite. It goes like this:
- 20-44: not much difference at all
- 45-64: bit worse every year, but more of a steady decline
- 65-74: there’s a big drop in mid-60s, but then it stabilizes (of course a lot have dropped out by then)
- 75+: the scythe is being sharpened - nobody escapes
- 55-65: Do CrossFit, Mountain biking, etc until wear and tear adds up. Can do pretty much anything if train for it and stay disciplined about scaling and stopping. 
- 65-74: Downshift. Good age for long bike rides, nordic skiing, etc.
- 75+: Functional exercise, balance, walks, swimming, shorter bike rides, nordic skiing, maybe the power trike, tourism.
 I figure by the time I’m 80 I’ll be able to hire a “life” coach to ensure I don’t overshoot (Ninja assassin experience a plus). Ok, a Death Coach.
 36 handstand pushups yesterday. Ok, so that was over 9 sets. And, yes, I used more than one ab mat. No, I won’t say how many I used. Still. Yeah, and PR on the back squat — even though the two women in the class beat me by 20 lbs.
 All favorites of mine. Today I can’t afford the time for a 4 hour bike ride, but when I’m 65 the time may be mine.
 Mine will have streamers.
 I have a PhD in CrossFit scaling.
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