It all boils down to the best of the three following approaches:                                             

1. You could be a "cool mom", and try to relate by talking like folks their age.

However, this usually backfires and makes you come across as someone who is trying too hard.
                            
In younger interviewer’s eyes, this most often comes across as “lame” and only highlights the age gap even more. This is why you should almost always avoid this.
                            
2. You could take the “grumpy, aloof elder” approach.

That's where you completely ignore the age gap and talk to them as you'd talk to an interviewer who's closer to your age.

And if they can’t relate or feel awkward, you could just say to yourself, "I'm not going to accommodate them – they can accommodate me." But that approach probably won’t help much.

3. You could take the “adult in the room” approach.

That’s where you acknowledge they're from a different generation, and try to be real and open, but not condescending or patronizing.

This approach works best.

However, the only challenge with this approach, as you can probably tell, is that it’s difficult to know where to draw the line.

Because you don’t want to talk like you’re their age, and you don’t want to treat them as if they owe you automatic respect, but you do want to be relatable and prove you’re the right candidate.

Getting it just right is a skill that requires understanding some important nuances and details. This is why you need to do as much research as you can before you go in an interview. If you can prepare for an interview with someone who is a lot younger than you, you’ll be able to handle it better and get that job offer.