Anna, I am about 6+ years older than Samantha and it does seem to take a little longer depending on your stature and weight.
I am 5ft 8in and 180 pounds, whilst a little overweight Lol

my mirror lies very convincingly for me
But to the point, with some extra body fat you can appear to have earlier progress. It took 2 months of PM to finally get the pain and soreness indicating growth should follow. I have been taking measurements throughout and these do provide the evidence that we are not kidding ourselves. I did take some further photo's last night and will compare them against earlier shots to see if it's noticeable to the eye.
I think I have grown but my wife has not commented which leads me to believe this process is for the long haul.
Good luck Anna, remember you have youth on your side, so envious and jealous in equal measures.
Hugs to all
Heather
XXX