The Science Behind Why Old Couples Start to Look Alike

TLDR Old couples tend to start looking alike as they get older due to a combination of genetics, shared facial expressions and muscle movements, and the influence of shared life experiences. This phenomenon may also be influenced by a preference for symmetry and the desire to seek out partners with good genes and reproductive potential.

Timestamped Summary

00:00 Old couples tend to start looking alike as they get older, and there is scientific evidence to support this phenomenon.
02:26 Old couples tend to look alike, and a study suggests that this similarity is due to genetics.
04:40 Old couples who have similar personalities may end up looking alike due to the shared facial expressions and muscle movements that come with a happy and enjoyable relationship.
06:49 Old couples who look alike may have a genetic compatibility, but the process of finding that out is unclear.
09:12 Women are more likely to seek out adult relationships with men who resemble their fathers, based on their strong bond and relationship with their fathers, regardless of genetic relatedness or adoption.
11:20 Symmetry, both body and facial, is equated with beauty and attractiveness, and studies have shown that people with more symmetry are perceived as healthier and more attractive, potentially due to an evolutionary basis of seeking out partners with good genes and reproductive potential.
13:40 Older senior adult couples who start to look like one another may be genetically similar to begin with and their shared life experiences shape their appearance, while some couples may also purposefully or inadvertently start to dress alike; similarly, people who shop for purebred dogs tend to look for dogs that resemble them, while those who prefer rescue dogs prioritize personality over appearance.
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