This question is difficult to reasonably answer, since we do not know what medical advances will be achieved in our old age. If we are moderately optimistic about the progress of medical technology, then we can hope that most people who are now in middle age and lead a healthy lifestyle have a chance to live to 100 years.
Genes, of course, affect life expectancy , but absolute numbers are growing thanks to medical advances.
I will draw an analogy with rats. Film Rats do not live long in the wild. About half a year. Rats in captivity live longer. About one and a half years with more or less good grooming. Rats in captivity and good grooming can live more than 3 years. Especially if you follow her diet.
People in the Middle Ages rarely lived to be 30 years old. The one that is already there, the Middle Ages. Even in the era of Pushkin, he called the 30-year-old old man. =)
If a person takes care of his health, you can live for 100 years. If not everyone, then the majority. As with the rats, I'm sure. Only nobody needs it.
In this situation, not only the genetic potential of a person plays a role, but also his lifestyle, way of nutrition, then where he was born, in what environment he grew up, in what city he lives, since if you grew up in a city where there are chemical factories or into the river from which you drink water discharge chemicals, naturally in this case, you most likely will not live up to 100. Genetics plays one of the main roles of your longevity and if the body does not allow you to exist anymore, then you will not exist, but you You can live longer if you follow a quality lifestyle (proper nutrition, less stress, exercise and much more), in which case you can get the most of your potential. Wish you live 100 years if you want)