Is Olympia wonder ability void for first age?
Just to clarify, this is the 2020 version of 7 wonders, in which some of the wonders are a bit changed compared to the original version. Olympia is one that's heavily changed.
Here is a nice video explaining the differences: https://www.youtube.com/watch?v=VXZND4aG1Lk.
Now to answer you question.
This is not an official answer, as I have none. But I am curious and as soon as I find out I will come back and post a link here.
But this is how I interpret it and how I play it.
I have the Romanian version, so not sure if stuff got lost in translation.
This is what my rule book says about the alpha symbol (translated by me).
&quot;After this symbol comes into play, you can build the first era card for free in every era.&quot;

Is Olympia wonder ability void for first age?

No.
There are cases in which you can benefit from it.

you build the wonder stage with the first card in era 1. This means the second card you &quot;play&quot; is the first card you build. So it's free. I still have doubts that I'm right here.  Anyway, this cannot happen with only the regular game because it would mean that both your neighbors have to produce stone on their wonder. And there is only one wonder that produces stone in the regular game (Gizah) and you would need 4 coins to pay for them but you start with 3. But it is possible if you play with the wonder pack extension or with the community extensions and extensions that give you extra money when you start.
you play with the leaders extension and you build the first stage of your wonder using the leader you should play before stage one. Since a leader is not an &quot;era card&quot;, the first card you play in the first era is free. This is more plausible but still highly improbable for the same reasons as above (you need 2 stones around you from the beginning). If you play with the leaders extension you start with 6 coins, that's why it's theoretically possible.