What metaphors should I use to describe an elderly man's face?

The easy way would be to describe some physical features: wrinkles, bags under the eyes, moles, etc. But more challenging to the creative impulse would be to catch in metaphor (or in similes—“like”) the experience, the accumulated wisdom, the understanding of human nature, etc. Try something like “In his face was a roadmap of the life’s journey his years had taken him on.” Or “The travelogue of his wisdom could be read in his tired...

The easy way would be to describe some physical features: wrinkles, bags under the eyes, moles, etc. But more challenging to the creative impulse would be to catch in metaphor (or in similes—“like”) the experience, the accumulated wisdom, the understanding of human nature, etc. Try something like “In his face was a roadmap of the life’s journey his years had taken him on.” Or “The travelogue of his wisdom could be read in his tired eyes." Or "His face was an introduction to the biography of a hero."  Physical metaphors, probably worn-out clichés by now, would be some variation on “His craggy cheeks, his limpid pools of eyes, his teeth a rotting fence, his chin multiplying into chins.”