Jabir b. Samura was asked about the old age of Allah's Apostle ﷺ. He said: When he oiled his head nothing was seen (as a mark of old age) and when he did not apply oil something (of the old age) became visible.
It also teaches us that we should always respect people regardless their physical appearances or ages as Allah looks at our hearts rather than our outward appearances. We should also strive to emulate the example set by Prophet Muhammad ﷺ in terms of taking care for ourselves and respecting others despite their ages or appearances.