老吾老以及人之老，幼吾幼以及人之幼
“lǎo wú lǎo, yǐ jí rén zhī lǎo; yòu wú yòu, yǐ jí rén zhī yòu”
“Treat the elderly as you would your own elders, and the young as you would your own children.” Mencius (孟子)
Found this quote in this interview of Michael Crook by Dan Vineberg.
There is something similar in the Bible, Paul’s letter to Timothy (1 Timothy 5:1):
“Do not rebuke an older man but encourage him as you would a father, younger men as brothers,”