Who are the best of our youth and the worst of our old ones?

Hawzah News Agency - The Prophet (S.A.W.W) says:

«خَيرُ شَبابِكُم مَن تَشَبَّهَ بِكُهُولِكُم، وشَرُّ كُهُولِكُم مَن تَشَبَّهَ بِشَبابِكُم.»

'The best of your youth are those who act like the old from among you, and the worst of your old ones are those who act like your youth.'

Wasa'il al-Shi'a, v. 5, p.25