There is nothing I cannot do because I am in perfect health.

Capability is nearly always assessed against a list somebody else wrote — the running, the hours, the stairs. That list is short and public and it leaves out almost everything.

The real inventory is longer and much odder. You can sit with someone whose news is bad. You can hold a slow queue without becoming unpleasant. You can learn a thing at fifty you would have found impossible at twenty. None of that appears on the standard list and all of it is doing. Whatever your body's current terms happen to be, the inventory is bigger than the list.