45-year-old Roana is said to be the UK’s oldest horse, with her owner revealing just how her sweet four-legged pal has outlasted the average 25 to 30 year life expectancy by more than a decade45-year-old Roana is said to be the UK’s oldest horse, with her owner revealing just how her sweet four-legged pal has outlasted the average 25 to 30 year life expectancy by more than a decade