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Realistically you will be at least 35 before you become a quant, since there is preparation to be done. That's not too old, and in many cases it is not the age itself that is the issue, it is what you have done with the time.  Making it up the tree in academia means that you have shown yourself to have delivered on your early promise, implying that you are bright, banks like that.

But you have to examine your motivations carefully, to see how much is "I want to leave here", and how much is "I want to be there".

One feedback we've had about some later entrants who have succeeded in their first path is that they seem arrogant, and this can lead them to worry that you won't be able to cope with the fact that you will be taking orders from people with only masters or even undergrad degrees who may be younger and inherently less smart then you.

Not saying you should undersell yourself, but you need to get past this issue.