In mice, reactivating the enzyme telomerase led to the repair of damaged tissues and reversed the signs of ageing.
That's the big news of the day. They did it with a protein that is presumably patentable once they get it fine tuned. But those of us who don't have time to wait might google "preserves telomeres" -
"Exercise preserves telomere length in the face of chronic stress ..."
"Omega 3 Oils Slow Aging by Preserving Telomeres"
"Stress Can Shorten Telomere Length and Age Cells Prematurely ..."