Difference between two dates for one unique value thats repeats itself

Hello everyone, my goal is a formula if S2 (and following values in S) matches any value in column B, then give me the difference in years and months from T2 and matching cell from column L belong to the matching value in B

The B column values are all from the same unique ID that have procedures in different dates. The idea is to get years and months since they've joined (column T) in all the different procedures. So say in the example I've done 1111 which joined on the 09/04/2018 is 5y and 8 months on the procedure dated 18/12/2023. It would be 5y and 6 months for the previous procedure on the 18/10/2023

So each value on S only has one unique date of joining (column T) but have different or equal procedures dates. Do let me know if I didn't explained correctly.

Do let me know if I haven't explained correctly or if you need any more information

Thanks!

Test11.xlsx