You can't sex them until their breeding tubes are out, and it's even iffy then, there are theories, but none are proven to be correct for a big percent of the time. As for age, I would need to know how big they are. How many inches across (Not including tail fin).
Welcome to the forum. SouthAmericanCichlids answered both questions nicely. I'm afraid your pictures don't give enough sense of scale to determine size, and as far as I know size is the best way to estimate age.