I just added a 2 year old 15k limit card... Was offered $25.00 which seems kinda low but I haven't been able to do anything with it anyways so may as well list it. If good company would take it I believe the payout would be $75 instead.
That payout must be for under two years. Once it's two years it should be at $75 if it's exactly 15k, $125 if it's at 15,001+. If I were you I'd lock it and wait for it to hit 2 years. Going from $25 to $75 (or 125) is a big difference.
Also, just a reminder to everyone to call and bump your limits -- going from $20,000 to $20,001 and making your payout jump from $125 to $175, for example, is a big difference, especially given the amount of work of adding an AU and the risk is the same, and just takes a 5 minute call or online change.