Recently the desire to not share account age has been a hot topic on the SecondLife Community Forums.
I think it would be nice for residents if we had the ability to choose not to share our account age in our profiles. This could be an account setting somewhere on https://secondlife.com/my/ for example.
Most residents are happy to share all kinds of things about themselves, but are less happy when information about themselves is shared on their behalf without being given a choice.
I definitely understand why someone would want to hide their account age, and I also know why people might want to know someones account age - I still think it should be the residents choice whether or not to share this information.