What @judi and @Tbushell said is correct. Another factor is neck length: a shorter neck will result in lesser tension on the strings, and thus in less force needed to fret a note.
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“Silk & Steel” strings are also a good option. Much easier on the fingers than all metal strings.
Also, when my girlfriend put them on her guitar, she found that it was much easier to finger the A chord than with all metal strings. Much less pressure was required to make all the strings ring.