One my cousins just had his done. His wife did hers in her 40s, by far the youngest that doc ever did. Great improvements for both.
I was 55 and found out in an interesting way in Cozumel. I was using a UV light on a night dive and could not see anything with my right eye. Turns out that that UV frequency is blocked by a cataract. Had my surgery 5 days after return. Both eyes are now 20/20. Amazing stuff. No glasses after 45 years!