Though she's no longer young, she's still full of 'vim and vigor'. [='vitality']
She defended her beliefs with great 'vigor'.
(..) Children arrive, years depart. And all of a sudden, your wife grows old and tired. And her hair is thin. And her body... And you yourself, you still have your vigor! And then you find yourself a martyr to distraction by so many women. Forgive me, but I find that incomprehensible. (..)2012 Anna Karenina