Woh don't worry Mo it won't be that fast. Adam, Mo is a youth (yes even younger than your good self ).
Mo the youth races are run in different age categories but you all ride together. It's a bit tricky to work out what's happening from the side when they're having their race(s) as there is a complete mix of ages riding around at the same time.
Even with all of you racing at the same time the field isn't that big and it spreads out so often only 2s or 3s riding together so you don't need to worry about having to jump in to the middle of a big pack straight away.
The different age groups seem to all line up together on the line and then be set off in blocks according to which race (age group) they are in. I guess that the race length is different too depending on age. There is one kid who is amazing to watch as he's so small he has to ride out the saddle all the way and sort of roll over his crossbar with each pedal stroke .
If you want full details then Paul T is your man as he's ACC's Road Race Guru and will be able to tell you everything. You may need to restrict your maximum gear for example, but this is easily done.
It starts up again next season in April (I think) and runs every Tuesday, weather permitting.
It would be great to see you give it a go, and as long as you're in an Addiscombe jersey you'll get plenty of support from the rest of us as we wait for our races.
All the best for a quick recovery from Saturday and glad to see you're keen to bounce straight back on the bike.