If you used the same password on multiple sites back in 2013, your information may be part of larger "megabreaches" like . You can check if your email was involved in a leak using these verified tools: How To See Your Saved Passwords On Android Phone
Which would you like?
Oldgropers.com appears to be a niche music or media-related site, but there is no public evidence of a specific username and password leak from . oldgroperscom username and password april 2013 better