Here are some Benedictine sisters in Chicago whose age requirement is between 21 and 50. osbchicago.org/vocations.htm
More Benedictines, this time in Oklahoma, 19 - 50 years old: redplainsmonastery.org/vocation.html
Another Benedictine community, 21 - 50 years old: stmarymonastery.org/vocations/becoming_a_sister/index.html
Many other orders I looked at had their maximum age set at 45 but stated they were willing to make exceptions on a case-by-case basis, usually with more discernment. So, as you can see, your age won’t stop you from becoming a sister, if you have the vocation and the willingness to look around.