I know the role of Kevin Buchanan is notorious for being recasted several times in the 1990's but i can't think of another character who was born on a soap (1976) and then had their 10th birthday on it too. By the time his brother Joey hit 10, he was already SORAS'd and so was his sister Jessica (but not by much.).
Can you think of another character from a soap who was born and then turned 10 in "real time." I know characters like Robin on GH and Starr on OLTL/GH started as children and stayed on for very long periods of time but Starr was a SORAS'd recast and Robin wasn't born on the show.
Soap Opera Rapid Aging Syster is so common on soaps, I bet Kevin is one of the few that is in both catorgories as the most SORAS'd and also a character they left alone to grow as a child.