I'm personally going through a time in my life where I'm learning truly how much being happy is important when looking for a partner. I hope u find someone ur happy with. Im not sure why age would play a factor in that tho....the only 2 things i can surmise is

1) that there would be a higher likelihood of her being more mature and level-headed having been through the gauntlet of life longer

or

2) you tend to just jive better with ppl from a slightly older generation

or maybe u just got a thing for older women

Aaaaaaaaaaaanyway, good luck man. With a positive demeanor like that, I think you're sure to find someone that will make u happy and vise versa :)