I would tend to think that this correlation has much more to do with your position in life versus anything else. Think about it.
When you got your first car/computer you had loads of time. You may have been dating, but you were not married with kids, bills to pay, etc. Now flash forward a few years. You are married with a few kids, bills to pay, a business to run, etc.
As your responsibilities have gone up your availability to "tinker" has gone down, which probably means that "tinkering" was at the lower end of your interest spectrum.
I would tend to think that this correlation has much more to do with your position in life versus anything else. Think about it.
When you got your first car/computer you had loads of time. You may have been dating, but you were not married with kids, bills to pay, etc. Now flash forward a few years. You are married with a few kids, bills to pay, a business to run, etc.
As your responsibilities have gone up your availability to "tinker" has gone down, which probably means that "tinkering" was at the lower end of your interest spectrum.