Why is it that older people become so damn flatulent?

Why is this? It seems to be more of a male issue, but it still applies to the ladies.You’ve noticed this, right? It’s happening to me as well. As I get older I tend to clear out more and more rooms. My elderly father is currently the “flatulence king” but I seem to be following in his footsteps.
So what’s up with old farts farting all the time?