Just read scriptures, from pretty much any religion.
They often contain graphic analyses of aging, illness and death.
And? So do most books, fictional and non-fictional.
It is only in religious scriptures that the discussion of aging, illness and death is contextualized by ideas of the ultimate liberation from suffering.
Aging is a part of life, as is illness and death. To claim that religious people are more in tune with those facts is a bit strange considering that it is something that everyone witnesses and experiences.
Of course on principle, everyone has to deal with aging, illness and death.
But people differ very much in how effectively they deal with them.
By "dealing with aging, illness and death" I do not mean 'avoiding or preventing aging, illness and death', but I am referring to the attitudes a person has toward them and whether these attitudes are conducive to finding happiness in life or not.
Secular sources are not famous for such analyses.
Possibly because we live it and see it daily. We see ourselves age as we look at our parents and other older family members and when we look in the mirror each morning.
Rather, secular sources are notorius for being unable to provide any real solutions to the problems of aging, illness and death - this is one reason why they are secular.