24/25 isn't old for a prospect to be called up. Well, maybe a little. But it's definitely not uncommon. I think Nats fans have been a little spoiled with the likes of Zimmerman, Harper, Rendon, Taylor, and Felipe Rivero.
Goodwin has been hampered by small, but nagging injuries the last couple seasons. Would be nice if he developed in to something serviceable, much like Souza has.