Publishing a Short Story (in Anthology) About My Grown Protagonist

I have an opportunity to submit a short mystery story in an anthology of mysteries. I have an unpublished historical YA romance/mystery novel with a 17 year old protagonist based in 1977 (that I hope to publish through traditional publisher). I have the idea to first publish a story involving this same protagonist who is now in her 60's, but is still solving cases with her bloodhound. This is NOT a direction I had planned on going, but its opened up a whole new idea for another series. Has this been done before? Writing about a protagonist as a teen and then also as an adult? I'm interested in reading other examples of this if there are any and receiving input.