Signal and veracrypt are not PGP replacements, not even remotely close.
Regarding age, one reason is that it only supports a small fraction of PGP functionality thus useless for many real world applications. Another is that it operates on top of a fundamentally different model and for many folks that model is worse and potentially less secure than PGP's if you try to replicate PGP functionality by composition [1].
Modern doesn't necessarily equal good. PGP is mature and solid which is why it's still widely used and remains popular.
Regarding age, one reason is that it only supports a small fraction of PGP functionality thus useless for many real world applications. Another is that it operates on top of a fundamentally different model and for many folks that model is worse and potentially less secure than PGP's if you try to replicate PGP functionality by composition [1].
Modern doesn't necessarily equal good. PGP is mature and solid which is why it's still widely used and remains popular.
[1] https://neilmadden.blog/2019/12/30/a-few-comments-on-age/