From what I see, this addy was recently used? You don't have one that's older that a few weeks?
CntryBoy has enough older addys posted:
13815FiWTGAyYY4a3p1ZV49FTcLvgVt5yG
1H4AxE9xEwfKui94SLZehyfUUESRMHoZZt
16jKTjN9D1XvTwx4V1gwZG9hcj8mELA3Ki
1E4vkUwGmkKndZDzUHXbnNEbTcax8D9QP9
October 23, 2017: 19zm4pF2MqKxNKTDFA3eye41TfCF4Afcdi[/url]
September 10, 2017: 1FX8gQE5aRJHh728FurvpzKntqcyWXMW8c
1Q2JuuU6aRGXJQoTLiGUrKSDGPgXL9UrHj
May 23, 2017: 12abRMw2jNaWuJvKjP2XmqCHpdvVxQAKoN
May 19, 2017: 1BmhHmNLXkmk5MizLRbV7yG3jjc2oMVvt4
Yes, I have posted older addresses. Most of the older ones are from my blockchain wallet, which I do not believe you are able to sign a message with. I will look into them and see if I am able to sign a message with one of the older ones as well.