I believe Age has nothing really to do with PE.
I’m 19, yes not exactly near 55, however in 30 days I have gained 1/4+ inches, doing the newbie routine, still have 2 months left on it, I figured I should hopefully be able to get another 1/2” however it varies.
Good luck with the PE program, keep at it! it really does work, hopefully you’ll be a fast gainer, make sure you are versed in the correct methods and you’ll be well on your way to a bigger penis.
Don’t ever be discouraged, and a tip is don’t measure every day or anything, if you HAVE to measure do it at least once a week.
GOOD LUCK!