Being the oldest guy at my work, the excuse of being an "Old Fart" didn't blow over too well. Fortunately I worked graveyard and had only two coworkers on my shift.
There was an unspoken agreement that bodily functions were a required topic. My sister ended up working at the same building, and the house boss told her "you'll hear a lot about BM here. Both about the client's and the staff's". And she told her so stoically, my sister didn't take her seriously at first..
We also had a new manager come through that wasn't expecting it. After she'd been on the job a few weeks, us staff took her aside and told her "you've been here long enough. Its time you share with us...." "What do you mean?" She was alarmed...but not as alarmed as what came next "So, how much do you poop? I go X amount of times, this guy goes twice a week, and that woman over there just went. How about you?" At first she was horrified, but we got the truth from her by the end of the conversation...
It was a high stress job that often entailed bodily waste. If you didn't develop a sense of humor about it, you didn't make it.