Why do we get OLD??

The again process is a real head scratcher for scientists. Healthy humans are capable of healing their injuries, recovering from illness, and replicating their cells again and again. Why can't this process continues forever?  Old age and death are hardly helpful to our species ' survival, after all. Scientists have studied nearly every type of animal -- from short lived flies to be defying flatworms to unravel this mystery.

According to the theory, our life Span is programmed into our DNA, which jump starts the again process once we are beyond our productive years. Scientists tinkering with the age related genes in some worms have been able to dramatically increase life spans.
Another theory holds that your cells have a sort of expiration date and can only  reproduce so many times. Some scientists believe that the longer you live, the more damage your body racks up. Eventually the humans machine becomes so bogged down with glitches that it can no longer repair itself properly. Likely, a combination of these theories can explain the again process. Our life span is also affected by many factors outside our bodies. How we eat, where we live -- even wetter we marry -- can influence our body's expiration date.

Who was the oldest human in the world ?
A French woman named Janne Calment lives 122years and 164 days in 1997 according to the Guinness world record.
She credited her routine snacking on chocolate for her amazing life span. Meanwhile, a Bolivian man named Carmelo Flores Laura may have surpassed Calmant's record. Goverment document show that Flores was born in 1890. Which would make him older than Calment when she passed away. Flores didn't have his original birth certificate though, casting doubt on his actual age, though casting doubt on his true age, he died in 2014.

When men get older ,why they get wrinkles ?
Once you reach adulthood,your skim stops growing. It loses its elasticity, taking a little longer to spring back into shape when you laugh or furrows your brow. Wrinkles from as your akin starts to sag in old age. A lifetime of smiling leaves wrinkles alongside your eyes, "crow's feet "