No... in the Spanish translation talk about "Veterans and youngers" Veteran don't mean always that is better than one that have 18, so, do a mix.

Is not related or about one season to another, is more about age groups we see in the market.

This means too, that you dont need a full new team every season, because good youngers can be one day good veterans so you can keep them and then, do a mix with some new youngs is more easy...