Vampiric power often resides in the blood. To emulate this, a vampire character can take a consequence and apply the number of stress usually mitigated by the consequence as a bonus to his Age roll. As a consequence he should take an aspect that alludes to her being hungry, starving, thirsty or worse.
One important note: vampiric powers are inherently nocturnal. They do not work in daylight as long as the sun is in the sky. Your vampire may not burn in the sun, but he is weakened and cannot use his Age score.
Slight change: In the last post, I stated that each vampire starts with one extra at no cost. I think, all vampires should start with two extras at no cost. Simply because Age can't be really used to attack, defend or create an advantage.
Also, the powers listed here are just suggestions. If you or your group comes up with any other ideas, just take those.