Playing in the lower leagues, I think it happens that we play older players a lot more than those who just go for easy glory (non LLaMas). I was just wondering how old your oldest player is? (he must have taken to the field, you can find it in your records screen).
In FM2007, mine was 45yrs and 72days. In a conference north playoff final. (what a way to bow out)
In CM4, I had several players playing well into their 50's, but think this was a bug as they had announced retirement 20yrs earlier and had spent 20yrs on a month to month contract as they wouldn't sign a new one due to impending retirement.