Years steal fire from the mind as vigor from the limb; and life's enchanted cup but sparkles near the brim.
Because scientists know that all human beings do not age at the same rate, biological age is measured by how well one's physiological systems are functioning.
Some people are old at 18 and some are young at 90. Time is a concept that humans created.
Age will flatten a man.
I was once six feet tall, but at 85, I'm now five feet four.
The stones and trees, insensible to time, / Nor age nor wrinkle on their front are seen; / If Winter come, and greenness then do fade / A Spring returns, and they more youthful made; / But man grows old, lies down, remains where once he's laid.
If the aging process is controlled in a similar way in worms and humans, then we can use what we learn about worms to speed our study of higher organisms.
You can open up a centenarian's brain, and you'll see some areas that look like that of a 50-year-old or of a 110-year-old. You can have variation in the basic process of aging, called senescence, in different parts of the same body.
The affections cannot keep their youth any more than men.
Our concepts of aging really should be blurring because there are plenty of people who make it to older ages who aren't really any different in many ways than people who are decades younger.
I don't see any absolute biological limit on human age.
Age is a slowing down of everything except fear.
The old age of lower mammals presents characters similar to those found in man.
As soon as a handful of scientists come up with an intervention shown to influence aging in other species, they begin selling it as an intervention for humans, even though there may not be evidence it works.
In humans, the thing is that as we mature, our telomeres slowly wear down. So the question has always been: 'Did that matter?' Well, more and more, it seems like it matters.
