good words.

“After all, 

what is the chief sign of feeling old?

Is it not the feeling that we know all there is to be known?

It is not years which make people old;

it is ruts,

and a limitation of interests.

When we no longer care about anything except our own interests,

we are then old,

it matters not whether our years be twenty or eighty.”

-from the Handbook of Nature Study by Anna Botsford Comstock