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Ageless
Timeless Appeal
Use 'ageless' to describe beauty or appeal that remains constant over years, never seeming outdated or old. 
Metaphorical Use
'Ageless' can be metaphorical, suggesting something that does not physically age, like an idea or tradition. 
Not Literal
Understand that 'ageless' is often not literal; people and objects all age, but 'ageless' can mean aging well 