No one is going to consistantly have an age where they'll like someone or won't. Attraction is not based on age, it is based on a combination of responses to that person's body and their mind. Obviously if you have higher standards (meaning older, not superior) then there will be an age of whom everyone that is that age is not appealing to you, but there is no scientific way of calculating that at all.

You should really stop using them.

Basically you're stereotyping everyone by age and generalizing, classifying. I know this is tempting to do, but it is ageist, and is exactly the same problem that many hate when people of such age are discriminated against by restricting their freedoms in a legal sense.