Remember they have racquets too. Prepare to chase lobs
My experience with guys in their 20s is that all they can do at the net is crowd it and bunt drop volleys. Particularly in doubles, they are really lost up there and turn to water in a close quarters exchange. So although I often play guys 30 or more years younger, I welcome them giving me a chance to get to the net as it generally doesn't work out well for them.