How much should a young centre-back be organising older players?

A centre-back does need to communicate, but organising does not have to sound like giving orders. Keep the information early, short and useful. 'Inside shoulder', 'hold', 'step', 'time' or using a teammate's name is often enough. Older players are much more likely to respond well to clear information about the game than to a younger player trying to sound authoritative. You can also ask rather than instruct in some moments: 'Can you stay a bit tighter when I step?' creates a conversation rather than a hierarchy. The important thing is that you do not stay silent because of age. If you can see a runner or a gap and do not communicate it, the team loses information it needs. Respect is not about never speaking to older teammates. It is about being accurate, consistent and speaking to help the next action rather than to show that you are in charge.