When you are born, as a baby, you are helpless, so you have adults wiping your butt and cleaning you up. As you get older, you are potty trained and learn to wipe your own butt and clean yourself up.
Then you go on to get an education, and hopefully, find a fulfilling occupation. Maybe have a family and kids of your own.
After a period of time, the infirmaries of old age start to creep in or maybe you get some debilitating disease and possibly end up in a nursing home or a long term car facility where you realize that you have come full circle and once again you have adults wiping your butt and cleaning you up.