What would happen if we remind in our 20's much longer?

If we were able to remind in our 20's for 30-40 years longer, what would happen? How would relationships be like?

Note: The men would be aging normally while the women would be in their 20's for 3-4 decades longer. If she was 22 in 2022, she'll still be 22 in 2044.
What would happen if we remind in our 20's much longer?
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