A question for X-fans from me, an outsider.
Now, the default with mutations seems to be that it comes about in puberty. Some others are evident right at birth, like Nightcrawler if memory serves. What about later in life? Can it happen in middle age, or older? Now, I don't mean "they had powers but they never came up" or suppressed memory of powers from a young age. I mean normal person who suddenly grows horns or starts breathing fire in their 30s or similar.
It's something I realized I just don't know about Marvel's Mutants.
Thanks in advance for any information.