I got 1.25” in 4 months at age 42. I was also a late bloomer, still getting taller until 21 or 22. I expect your chances of results are excellent.
I also gained well in excess of an inch in a tad over 4months at the age of 44. But, was called a liar and told it was impossible so i have started keeping things to myself instead of sharing with people.
*(started with 5.5~5.7BPEL depending on EQ and now i am 6.8~7”BPEL depending on EQ and a solid 6” MSEG and 6.5”BEG)