Be careful using such a small light source (relative to the subject) you may accentuate wrinkles and end up in the doghouse for completely different reasons - a larger, softer, diffused light might be a better bet. I know it's talking in stereotypes but hard light is great if you want to accentuate the character (ie wrinkle) of an elderly male sitter but less flattering to women as they get older. Subtly persuading them to wear a hat might be a good idea - similarly, a shawl is great for covering up those bingo wings...

Regards
Jerry