I play St. Albans in England (starting out in the National League South) and and currently in League 2.
I started out only with the Senior Squad and the U18 team - no U23 Team. I figured that this was something that would possibly right itself after a couple of promotions and turning professional. However, having since turned professional and being promoted twice (granted only up to League Two), I still do not get an option to start an U23 team. I looked around a couple of clubs in league 2 and noticed that some of the smaller ones also do not appear to have U23 sides.