It's a common movie trope to see elderly people dispensing wisdom to younger generations before vanishing off into a death mist. Sometimes, it's a poignant scene where a young protagonist sits at the foot of their grandpa's bed, before he utters final philosophical words of reflection.
Other times, an elderly side character will mysteriously enter a scene in order to give a magical and near prophetic message. While older people are just that - people who are older, and plenty don't have special mind-blowing knowledge to hand out like candy, there is something to be said for the truths you learn after being on earth for decades.
Those lucky enough to have close relationships with grandparents often have stories or special words they carry with them through time.
My grandfather lived in Yugoslavia before and during WWII. When I was 14 we had a family reunion in rural Indiana. When we were alone for a moment, grilling some chicken, he said to me, "You're 14, yes? When I was your age I was walking in the mountains with a machine gun."