people party alot 20+
before that its not really worth it, try to find a friend and duo with though... faster SP and less downtime.
there is currently no way to "flag" for LFG, sorry. There are dedicated linkshells for LFG/LFM related messages though the one I am in is mostly rank 30+.
FFXI 2003-2007: Elaron ~Phoenix
FFXIV 2010-> : Gus Morgan ~Wutai