I think it all falls into being capable to do anything and not having the capacity to do it, as humans we need to understand the difference between both.
Right now I feel like I have youth on my side and I could probably do anything but do I have the means to do most of these things, nope and self awareness of this fact is very essential.
I think even if you had the means, you are still going to be directed by your genetics or, the way you think and the things you like. Some things will be impossible for you, even though physically you could do it.
This is very true, and I think the realization of this helps a lot in planning and decision-making.