First off, it is difficult to delegate when one doesn't do it/hasn't done it themselves. Meaning, get to know how your unit runs, be willing to pitch in a hand in the bedside care, listen when your staff tells you something doesn't work. Be present at report, and know who you have on the floor for patients, and what their needs are.
Be invested, be involved. Get to know the strengths of your staff. If 2 PCA's work well together, then they can go down the line of patients together--setting up for breakfast, showering patients, etc. And be crystal clear that they are to set up, wash up, vitals, FBS, peri care, turn and repo. If they are not doing that, then you need to deal with that. Maybe one group can have a day where they just do stocking and such, so that each group gets a day that is a "break.
As far as your nurses, Make a plan/assignment according to strengths of your nurses. Ask your whole staff what they would like to see happen on the floor and how the floor should be run. Play to the strengths of your nurses. Buddy up nurses so that everyone gets a lunch, a break. Ask if they need to you to help.
Morale goes in the toilet if the supervisor is a degreed nurse who has never done bedside care, or hasn't in years, comes out of an office to delegate, and lets their staff run around like crazy people trying to get it all right and on time, then coming out of said office, only to reprimand on what is not being done.
Nurses get stressed when they are overwhelmed. Too much to do with too little time. More patients than they can care for appropriately. Make yourself available for morning med pass. Help if there's lots of admissions. And ramp up your per diem staff that can be called in a pinch.
And if one of your senior nurses tells you that something is not going to work well, then I would believe them, and ask for input on what should be done to correct it. Because one can have a BSN/MSN/PHD and a thousand credentials and letters after their name, and still have no clue how to delegate patients/work load appropriately. That comes from actually working in the trenches. And then it doesn't matter if you are 29 or 49 years old. Advocate for more staffing if you need it. In this day and age of "customer service" it adds a layer of care that can add to the feeling of being overwhelmed. Another thought is to have your most senior nurses take a charge role that they do the paperwork, call the docs, cover for lunches, and don't take a specific assignment. BUT if you are going to do that, make sure there's enough nurses taking assignments so that the ratios don't increase.
Disrespect/"not listening" however you want to describe it has more to do with setting staff up to fail, unrealistic expectations, and overwhelming work loads than age. It has everything to do with experience. And if you are a new nurse, you need to put on a pair of scrubs and engage yourself if your floor.