That headline is mostly clickbait.
A viral article appears to be referring to fingernail growth rate and claims that slower nail growth reflects biological aging and therefore may relate to longevity. The Hearty Soul
However, there is no single fingernail sign that can reliably predict how long you will live. Nail growth naturally changes with age, and nail appearance can also be affected by nutrition, medications, injuries, and medical conditions. SciELO Mexico+1
Some nail changes can be useful warning signs—for example, persistent clubbing can be associated with heart or lung disease, while certain dark streaks can warrant evaluation for melanoma. Elsevier E-Library+1
Bottom line: Your fingernails can provide clues about health, but they cannot tell you your life expectancy.
Sources
