[quote=@Cu Chulainn]
I've seen that there has been an issue regarding youger Servants, so I'd like to point out that the "cap" for Servant Eligibility seems to be if they were born before the 1900s, since we still have some canon Heroic Spirits who were born before then, but were made famous of their deeds during this timeframe.

Of course, I'm not the GM, so it's not for me to officially decide.
[/quote]

1900 is about the official "cap", yes, however, Servants younger than 300 years are usually not worth bothering with, minus a few exceptions. They certainly would not be high on the list of catalysts Lord "Professor" Arieh Ayondale would be seeking, to be sure.