As a 40+, 2x National Double Gold Medalist in TaeKwonDo I truely appreciate the thin division! Especially in the Featherweight division!!! Last year, my competition in sparring was 1. In my training up to that I probably faced at least 40 members of our team.
In forms there were 6 of us in the plus 40 group.
I have fought younger and much heavier...My first fight ended up with 3 cracked ribs from a guy 35 pounds heavier. I have also fought guys 70 pounds heavier than me and won by TKO. For me to drop an age bracket is not worth the risk of injury...I know I can not jump wheel and most 20 something Black Belts can!
Let's face it the older we get the more injuries occur and the healing is not as quick. There are issues with kids, work, spouses, etc, too. Pacing ourselves is crucial in training!
For example, this last Friday night I was the only male over 45 and under 5'7". The big boys were there and I am smart enough to not hold bag for step in side kick!!!!
On Saturday we had a ground fighting seminar, for Black Belts only, there were 6 of us over 40! I guarantee we are all bruised and everyone walked out on their own 2 legs....albiet kinda slow!

I will be in Detroit this summer going for my 3rd straight double gold victories...Black Belt, Featherweight, 41-50 division...I would not be surprised to have as many as 3 fights or none. In forms I expect there will be as many as a dozen.