( I used to have to change (actually clean) the oil filter in my 1970 VW Beatle every two-thousand miles. and adjust the valve backlash. That's why that mental connection was made for me.)
What Makes an Elder? :
A head of gray hairs doesn't mean one's an elder. Advanced in years, one's called an old fool.
But one in whom there is truth, restraint, rectitude, gentleness,self-control, he's called an elder, his impurities disgorged, enlightened.
-Dhammpada, 19, translated by Thanissaro Bhikkhu.