As far as I remember, Elves are fully mature (i.e. reach the forms they are seen with for a long time) by the end of their 100th or 200th year. Of course, while I used to know this, I'm bound to be wrong. Hopefully someone more learned and higher up in the pecking order of the Downs, so to speak, will correct me if I'm wrong.
Cirdan had a beard because he was extremely old. There are three stages in Elven life, and an elf doesn't grow a beard until the third stage, though there are exceptions (i.e. Thranduil). Cirdan was well into his third stage of life, so he had a beard. ^_^
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