I generously show my cleavage. I figured once I'm old and wrinkly it doesn't make much sense to show cleavage. It'll be a massive eyesore! So why not do it when I'm young and nubile.
Very nice I might say... but I think you have a wrong impression about aging... like boobs don't usually shrivel up in a way that you cannot show cleavage... you bra them puppies and drop that neck line and they still do their thing.