I’m in my 50s now and I find I need 6 to 8 oz / 7 to 10 days. Thats a little more than used when I was younger.
I have found my own needs vary as I have gotten older. I’m better able to control my issues now, but then I now think ahead and try to play so I have blood on hand when I need it.
I went through several stages in my life when I had no cravings at all, but those were during my childbearing years. I think hormones can really affect how much a Vampire needs at any given time. I found while I was going through menopause I craved blood almost constantly. Its leveled out again now.
Aging can certainly affect your needs, but I find it also affects how you approach Vampirism and your need. You learn to be wiser and plan ahead.
I’m Sang only. While I CAN psi feed it does me no good as far as replacing a blood feeding goes. I require blood. Psi does not help me at all with my actual NEEDS, even if I find it fun to do on occasion.