Do you you agree that people's 40s (age group) will become the new 30s with today's more advanced diet and medicine?

For instance, I see plenty of men and women in their 40s and some even in their 50s, still in very good physical shape and look attractive for their ages.
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Do you you agree that people's 40s (age group) will become the new 30s with today's more advanced diet and medicine?
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