A few things could be happening here.
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Vaginas lose elasticity as people get older. But this wouldn't explain depth.
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You and your partners could have subtly learned better techniques for your bodies. I used to get cervical trauma way more when I starfished with spry young jackhammers.
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Nerves. Women who are used to sex know how to relax and how to get themselves in the mood.
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Size of the woman doesn't indicate the size of the vagina. Just like dudes and dick size.
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Small sample group/cognitive bias. You haven't slept with enough women or taken proper notes, so your anecdote might be incorrect.
More information from Australia, if anyone's as morbidly curious as I was. Do not click unless you crave depression.
https://www.abc.net.au/news/2025-10-26/child-sex-dolls-sold-on-temu-and-shein/105636720?future=true