We’re more familiar with the older areas in La Costa. Some streets have lots of kids because the older homes have turned over after the original owners passed away. Some areas have more rentals, and they can have quite a few kids, as well. It really depends on the individual streets, as some streets are more active than others.
If you have any specific questions about streets or neighborhoods, feel free to ask here or on PM.
The LCV neighborhood is our favorite as far as the newer areas are concerned. Nicer homes, generally larger lots, etc. The Davidson homes are especially nice, but those are going for more money now. Still worth watching the area as a well-priced home will come on the market (and go fast) every now and then.