Looking younger means better genes?

I often hear the following statement from people who look younger: 'Good genes' - Because they look younger.
I do not understand the reference to the whole organism. If someone looks a few years older, it does not mean that their '' bones '' and everything are at this stage and break '' earlier. Someone who is e.g. 20 and looks like 12-14 doesn't have the bones, the muscle building and everything like a 12-14 year old? If there's no disease involved (extreme example).
I don't find any references to the entire organism in Google - the skin just looks older or younger.
Could someone explain that to me? Youtube video, suitable article or other is sufficient

Is also related to healthy eating and lifestyle.

Looking younger is not objective at first but only opinions of others. But actually, looking younger is a sign of good genes or a good lifestyle

Someone who, for example, has a very healthy diet, does sports and is still estimated to be 5-15 years older on average - the genetics behind it are more relevant, for now

It's just a phrase.

Just like a 'beauty sleep' doesn't make you more beautiful.

May be… So my grandmother is 96, whose sister was 93 years old and I generally have old relatives.

if i watch my diet a little, i look like 18 although i will soon be 30.

my cardiologist said with my heart i can live to be 100 years old.

I know my way around because I've read a lot of books about it. Genetics are not as important as lifestyle.

Genetics is the main framework. How to shape it and where it goes is another matter. But if the genes say '' you have blonde hair '', no matter how you eat, you won't get blue hair - it doesn't work like flamingos.
The question is to what extent the hereditary disposition for '' younger appearance '' affects the body as a whole

Genetics has a big influence on aging BUT it can be extremely influenced and delayed for 15 years. Read the book by professor david sinclair who has been researching the topic of aging for 25 years

This is only colloquial, so you won't find anything about "good genes" on reputable sites.