As a postscript:
I think the client deserves to know the age of the SP, as it is sometimes part of the experience he, or she, is looking for.
Also, if age is of importance to the SP, he, or she, should state this in their ads. NO-ONE should see anyone the don't want to. Be it SP or client! I believe we should all be mature enough to realize this and not be offended by another person's preferences.