When is the best time to take a vitamin for a man my age?

Vitamin insurance. A good multivitamin is a type of insurance for what you may miss in diet. This is important because the quality of food is deteriorating due to soil being depleted of minerals, toxins, etc. Starting at your age is a good idea. Please get a good quality vitamin, not the common brands over the counter. Many have just enough in them to be legal. 100% of an ingredient is often not enough.