If you're referring to Premium stats like @mentions and Retweets then the answer is most likely no.
The Twitter API limits how much historic @mentions and Retweets we can get. Depending on how much @mentions you have we can get months, weeks, or just a few days.
The "Tracking since" text refers to the first basic stats record (followers, following, tweets) we have for your account. Since @mentions and Retweets are part of our Premium package these were not tracked at that time.