No, that's wrong, this isn't the 90s. the game has moved on, the present is telling us this.
Which props in the game are considered the best in their position, and how old are they? How many 30 year old props are labelled elite, and not at the backend of their careers
Ah whilst I agree with you that props are maturing earlier than they used to, there are lots of props near 30 who are still elite-level. In fact many of the top forwards in the game 2023 are well past 25.
For example by post contact metres 2023, the Top 10 forwards, in order, are:
Hass (23 years old), Junior Paulo (29), RCG (29), Tapine (28), Flegler (23), Saifiti (26), Tino (23), Taumololo (29), Corey Jenson (29), Tom Burgess (30). That's an average age of 27.
The top 10 forwards for total metres gained is almost exactly the same list, but Bryce Cartwright (28) and Patrick Carrigan (25) are included.
I think it's more an argument that props can definitely peak early (better training, early talent ID, sports science etc.), and the second component is whether or not they can maintain that peak.
Specific to Stefano, he's a few years behind this cohort, and also he has the issue of matches played, which I think is overlooked - sometimes it's total experience rather than age that helps a forward most. That's Tim Sheens' old measure that he doesn't think you are an established FGer until you've played at least 50 matches (Stefano has played 37).
Even Payne Hass, who is only 1 year older than Stefano, has played 85 club games, not to mention his rep career.