This is called proliferation - usually some form of damage causes it - maybe cold, maybe damage to a bud in the early stages, or sometimes just a bit of genetic misinformation. Nothing to worry about.

thank you Bamboo i have seen it on other plants..this aeonium always flowers...i wonder how it will look...

Fasciation is fascinating!

Thanks for the correction, Owdboggy. I tell you, my brain is going - when I typed proliferation, a small, faint alarm bell rang, but no other word was offered up by my brain cells. Fasciation it is, I stand corrected. Although the causes are as I described, it was just the name I got wrong, Sandra.

Sorry, Bamboo, was not correcting you, was just making a pun.
Fasciation is caused by proliferation of cells at some point on a plant.

now i remember i've heard that word before...should have remembered as it is very fascinating..lol

Don't apologise, Owdboggy, I could do with as many aide-memoires as I can get now...