Respect RealityHe/she is your boss. Whether you like it or not, the facts are the facts. If you don’t like the fact that this person is your boss, you have two choices: get over it or get out.
Learn from this new situation. Your boss got this job because his/her boss felt they had the necessary talent to handle the job the way that person wanted it done. You need to figure out what skills your boss has that are stronger than you own that you can learn from. Is he a better networker? Is she better at prioritizing conflicting demands for resources?
At the same time, figure out where you new boss is weaker. This is not so you can undermine them, but so that you’ll know where you can be a valuable resource to them.
Outproduce EveryoneYou have the smarts and the experience to produce more and better work than others. Don’t flaunt it. Don’t talk about it. Just go out and do it. And be very sure you don’t talk about how good you are and then fail to deliver.
Make The Team WorkYou need to figure out how you and your boss can work together as a team. As the older person, it’s probably up to you to take the first step here. A good first step is finding out how your boss prefers to communicate and then adjusting to that style, rather than expecting your boss to change to accommodate yours. Does your boss like face-to-face chats or does he prefer texting? Would she rather you called or sent email?
What about working hours? Do you like to work start work right at 8AM and head for home at 5PM? Does your boss wander in sometime between 9-11 AM, but work well past dinner time? You will need to openly discuss the differences and come to an agreement.
Over CommunicateYou don’t want your boss guessing what you’re up to. He/she may imagine the worst; like that you spend all day plotting how to overthrow the boss. Let your boss know what you’re working on, what you’ve accomplished, and how you are actively supporting his/her agenda.
One very senior Product Manager I know used to schedule “impromptu” meetings with his much younger boss. These meetings would block out his time so no one else could schedule anything for him and they would pop up as reminders. He would then “wander down the hall” past his boss’s office and stick his head in “just to see how things are going”. It saved the boss having to call him in to ask about something. It became a sort of “since you’re here, let me ask you about…” conversation.