User blog comment:HolyMotherRose/Does Alphonse romantically like Mei Chan?/@comment-187.64.15.52-20120825201043/@comment-1618178-20120826122824

You're absolutely right! Many people might find it weird because they think May is much younger than Alphonse, which is a little misplaced. Alphonse is merely 14-15 years old thoughout the manga. We tend to forgot he's still "a child" because of the armor, but he's very young.

And May, instead, is actually around 11 years old, according to official guidebooks and, is also very "small" and "young looking" for her age.

Either way, 3-4 years is a perfectly normal age difference for a pairing, especially if you consider they "got together" after the series, and not during, which means they were a little older, then. In fact the age difference between Al and May is actually around the same as the difference bewteen Mustang and Hawkeye.