The only job I’ve had where I might have been “managing” employees older than myself we never had any issues because of an age gap. In fact, I even trained a guy to operate the same machine I ran who was like 30 years older and we got along great.
The best advice I can give is simply: don’t make it a big deal and they probably won’t either. I showed them the same amount of respect I would to someone my own age and didn’t treat them like they should be “higher up” in the field because of their seniority.
In my situation the older guy I trained was a railroad worker for like 20 years before switching to the machining job; we both understood that I had a couple years ahead of him at this particular facility and he took the opportunity to ask questions learn a lot while we worked together.