When we can apply for ILR?

I’m an EU national with my Iranian national wife came to UK on 29th of March 2014. My wife came to UK with a family visa and on 25th of June 2014 she got a resident card of a family member of an EEA national for 5 years. On 29th of March of this year it will be 5 years we are in UK. And my question is, when we can apply for ILR ? Is it possible to apply two months earlier?

Thanks very much.