I would be the charming, charismatic, friendly, devil-may-care, poker player/person I always am. Sure, an old guy my age appreciates the attention of good looking women, but that does not impact my gameplay at poker. Not a chance this hot woman has any ulterior motives when flirting with an old guy, especially when I am not showing off a huge wad of cash or any other signs of being a rich tycoon.
If my hand is a winner, I re-raise, or push all-in. She can flirt and play poker all she wants. Her flirting does not impact my poker decisions. I am a great multi-tasker.