If you struggle to chase toddlers in your 40s that's you own god awful choices at play. Likely donuts, beer and Beetus. I'm fitter now than my semi-decent 20s and shouldn't dip too much till my late 50s at earliest.
There's well known drinkers that come into my shop in their 70s who would put people in their 30s to shame. The 3 of them still work as labourers.
It is not about struggleing to run after toddlers in your 40s. You can't argue anyone younger that 40 can beat your energy level though. If you're too unhealthy to run at any age you probably shouldn't have kids to begin with.
It also doesn't matter what you do in your 70s. If you want to work then go for it. The whole point is there's a difference in wanting to work in your 70s and not being able to do what you want cause you have to work.
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