Age does not make us childish, as men tell,
It merely finds us children still at heart.
In German: Das Alter macht nicht kindisch, wie man spricht, Es findet uns nur noch als wahre Kinder.
Variant translation #1:
Age does not make us childish, as they say. It only finds us true children still.
Variant translation #2:
Age childish makes, they say, but 'tis not true; We're only genuine children still in Age's season.
Faust pt. 1 (1808) 'Prologue in the Theatre'