Deer can live to be older..however the oldest deer was a doe aged at 22yrs old in CAPTIVITY! ! Typically wild deer succumb to GASP..disease such a cwd or recently blue tongue (I.h.d) ipizootic hemorrhage disease. Wild bucks do not live as long for another reason is the stress the bucks go through physically cause of the rut. Also motor vehicle accidents...fights..ext....so yes the average age for most deer in their prime is 4-6 years old with proper nutrition and pleny of food so the older bucks don't have to compete and be ran off by healthier stronger bucks. So again this paricular buck is 4-5yrs old..your honor the defense rests its case.