I have bikes, and they are fantastic transportation. For the same amount of work as walking, you can easily go 10 times farther. Add cargo to the mix, and easily go 20 times farther.
On a related topic, in my 40's, I am considering getting into dirt bikes for the first time in my life. I see them as as a useful tool to have in a crap hit the fan situation. I figure, in some cases, a bike will not cut it where a dirt bike will. For example, very hilly and rough dirt roads, a dirt bike will handle that like it is not there, while a mountain bike will give me an unwanted extreme workout.
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If you're reading this, it's too late.