Active Male 65 Yrs Old, Non-Smoker, Up Until 5 Yrs

Active Male 65 yrs old, Non-Smoker, Up until 5 yrs ago, Heavy Drinker, None Since. My question is ? I am now in very good shape and would like to stay that way. I take Multi Vitamins but have been told that Green Tea Extract, Alkaline water and higher doses of individual vitamins & minerals should be considered.
Your Thoughts,
Thank You,
Greg D.